Image Trace: photos are smoothed within their tones first, and stacked layers go by lightness

A photo's noise is as large as the step from one palette colour to the next, so noise decided pixel by pixel
which of two neighbouring colours a pixel got: tens of thousands of specks, or (since the palette change)
neighbouring tones merged into one.

- A continuous-tone image (eight colours leave much of it unsaid; flat art, however noisy or unevenly lit, is
  not one) is smoothed before it is quantised: three rounds of a small bilateral filter, which averages noise
  away within a tone and keeps the edges between tones where and as sharp as they were.
- With Method: Overlapping, layers are stacked by lightness, from the largest colour's end of the scale,
  instead of by area. Each layer reaches under those above it, so where two colours meet every layer between
  them in the stack ends on that same edge and shows through its anti-aliasing: by area that was an unrelated
  colour's hairline around every region; by lightness it is a neighbouring tone.
- Ignore White with Overlapping: no layer reaches under the white that is left out.

On each preset's own inputs, all sizes and variants (docs/image-trace-quality.md), before -> after:
- High Fidelity Photo: colour error 2.37 -> 1.75 (2.30 at the baseline), edge error 2.59 -> 1.98, 639 -> 121
  paths (3,653 at the baseline), 25,604 -> 9,818 anchors, specks 152 -> 10; a 16 megapixel photo-like image is
  traced in 3.5 s (31,131 paths) where it was refused
- Low Fidelity Photo: colour error 2.67 -> 2.45, 55 -> 37 paths
- Shades of Gray: 73 -> 17 paths, colour error 9.33 -> 9.26
- The other presets' numbers are unchanged

crates/trace/src/lib.rs

@@ -12,6 +12,9 @@
 //!    colours: the blends that anti-aliasing and blur leave along edges take none of it, colours that
 //!    noise made of one colour are merged, and a blend pixel goes to one of the two colours it lies
 //!    between (see `quantize`).
+//!    A continuous-tone image (a photo) is first smoothed within its tones, edges kept (see
+//!    `smooth`): otherwise its noise decides, pixel by pixel, which of two neighbouring tones a
+//!    pixel gets, and every such pixel is a speck.
 //! 2. **Remove noise**: 4-connected same-colour components smaller than `noise` pixels are merged
 //!    into their most common neighbouring colour.
 //! 3. **Follow boundaries**: for each colour layer, the pixel-crack edges between inside and
@@ -41,6 +44,7 @@ mod fit;
 mod logo;
 mod mosaic;
 mod quantize;
+mod smooth;
 mod subpixel;
 
 use std::sync::atomic::{AtomicUsize, Ordering};
@@ -457,6 +461,9 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
     if params.mode == Mode::Logo {
         return logo::trace_logo(img, params, max_anchors);
     }
+    // A photo is traced from a copy with its noise smoothed away (see `smooth`).
+    let smoothed = (params.mode != Mode::BlackAndWhite && quantize::continuous_tone(img)).then(|| smooth::smoothed(img));
+    let img = smoothed.as_ref().unwrap_or(img);
     let mut q = quantize(img, params);
     denoise(&mut q.labels, w, h, params.noise as usize);
     // Pixel count per palette entry.
@@ -469,6 +476,19 @@ pub fn trace_within(img: &Raster, params: &TraceParams, max_anchors: usize) -> R
     // Layers bottom → top: largest area first.
     let mut order: Vec<usize> = (0..q.palette.len()).filter(|&i| counts[i] > 0).collect();
     order.sort_by(|a, b| counts[*b].cmp(&counts[*a]).then(a.cmp(b)));
+    if params.method == Method::Overlapping {
+        // Stacked layers go by lightness instead, from the largest colour's end of the scale: each
+        // layer reaches under all those above it, so where two colours meet, every layer between
+        // them in the stack ends on that same edge and shows through its anti-aliasing. Neighbours
+        // in a picture are mostly neighbours in tone, and in this order they are neighbours in the
+        // stack too (by area, an unrelated colour's edge would shine through as a hairline).
+        let light = |i: usize| q.palette.get(i).map_or(0, |c| u32::from(c[0]) * 299 + u32::from(c[1]) * 587 + u32::from(c[2]) * 114);
+        let first = order.first().copied();
+        order.sort_by(|a, b| light(*a).cmp(&light(*b)).then(a.cmp(b)));
+        if first.is_some_and(|f| order.iter().position(|&i| i == f).is_some_and(|at| at * 2 >= order.len())) {
+            order.reverse();
+        }
+    }
     let mut rank = vec![usize::MAX; q.palette.len()];
     for (r, &i) in order.iter().enumerate() {
         rank[i] = r;
@@ -538,6 +558,11 @@ struct Layers<'a> {
 }
 
 impl Layers<'_> {
+    /// Ignore White: white is no part of any layer (stacked layers reach under the layers above
+    /// them, and must not reach under white that is left out).
+    fn ignored(&self, label: u16) -> bool {
+        self.params.ignore_white && self.q.palette.get(label as usize).is_some_and(|c| is_white(*c))
+    }
     /// How far the edge lies from a crack between two pixels, towards the outside one (−0.5 to 0.5).
     ///
     /// Each pixel of the column across the crack is read as a blend of the tones on its two sides
@@ -649,7 +674,7 @@ impl Layers<'_> {
             .map(|(i, &l)| {
                 l != TRANSPARENT
                     && !thin.get(i).copied().unwrap_or(false)
-                    && if overlapping { self.rank.get(l as usize).is_some_and(|&lr| lr >= r) } else { l as usize == ci }
+                    && if overlapping { self.rank.get(l as usize).is_some_and(|&lr| lr >= r) && !self.ignored(l) } else { l as usize == ci }
             })
             .collect();
         // Without Fills, areas are outlined with a 1 px stroke.

crates/trace/src/quantize.rs

@@ -305,6 +305,35 @@ fn settled(mut q: Quantized, img: &Raster, own: &[bool]) -> Quantized {
     if changed { compact(q.labels, q.palette) } else { q }
 }
 
+/// Whether `img` is continuous tone (a photo, a gradient) rather than flat art, however noisy
+/// or unevenly lit (a scan): whether eight colours leave much of it unsaid. Flat art is a few
+/// colours and what noise and lighting make of them, and eight colours come within a few levels
+/// of every pixel; a photo's tones spread all through its range, and eight colours stay far from
+/// most of them (more than 6 levels, and more than a tenth of how far a single colour stays).
+pub(crate) fn continuous_tone(img: &Raster) -> bool {
+    let hk = HistKey::new(img);
+    let mut bins = vec![Bin::default(); 1 << 15];
+    for p in img.rgba.as_chunks::<4>().0 {
+        if p[3] >= 128 {
+            bins[hk.key(p[0], p[1], p[2])].add(p);
+        }
+    }
+    let used: Vec<Used> = bins.iter().enumerate().filter(|(_, b)| b.n > 0).map(|(i, b)| (i, b.mean(), b.n as f64)).collect();
+    // The root-mean-square distance (levels) from the pixels to the nearest of `k` colours.
+    let unsaid = |k: usize| {
+        let colors = centers(&median_cut(&used, k, 0.0));
+        let (mut sum, mut n) = (0.0, 0.0);
+        for (_, c, weight) in &used {
+            let d2 = colors.iter().map(|m| (0..3).map(|ch| (m[ch] - c[ch]).powi(2)).sum::<f64>()).fold(f64::INFINITY, f64::min);
+            sum += d2 * weight;
+            n += weight;
+        }
+        if n > 0.0 { (sum / n).sqrt() } else { 0.0 }
+    };
+    let eight = unsaid(8);
+    eight > 6.0 && eight > 0.1 * unsaid(1)
+}
+
 /// Drop unused palette entries and merge duplicates.
 fn compact(mut labels: Vec<u16>, palette: Vec<[u8; 3]>) -> Quantized {
     let mut used = vec![false; palette.len()];

crates/trace/src/smooth.rs

@@ -0,0 +1,97 @@
+//! Edge-preserving smoothing of continuous-tone images before they are quantised.
+//!
+//! A photo's tones run into each other, and its noise is as large as the step from one palette
+//! colour to the next: quantised as it is, noise decides pixel by pixel which of two neighbouring
+//! colours a pixel gets, and the trace is tens of thousands of specks. Each pixel is averaged with
+//! its neighbours instead, each weighted by how alike it is (a bilateral filter: C. Tomasi and
+//! R. Manduchi, "Bilateral Filtering for Gray and Color Images", 1998), so that noise within a tone
+//! is averaged away while an edge between two tones stays where and as sharp as it was. Three
+//! rounds, each along rows and then along columns, three pixels at a time.
+
+use crate::{Raster, parallel_map};
+
+/// Colours this far apart (levels, all channels together) count half as much as equal ones.
+const ALIKE: f64 = 20.0;
+
+/// One pass along rows (`dx = 1`) or columns (`dx = 0`).
+fn pass(src: &[u8], w: usize, h: usize, along_rows: bool) -> Vec<u8> {
+    let rows: Vec<usize> = (0..h).collect();
+    let px = |x: usize, y: usize| src.get((y * w + x) * 4..(y * w + x) * 4 + 4);
+    let done = parallel_map(&rows, |&y| {
+        let mut out = Vec::with_capacity(w * 4);
+        for x in 0..w {
+            let Some(p) = px(x, y) else { continue };
+            if p[3] < 128 {
+                out.extend_from_slice(p);
+                continue;
+            }
+            let near = if along_rows {
+                [(x > 0).then(|| (x - 1, y)), (x + 1 < w).then(|| (x + 1, y))]
+            } else {
+                [(y > 0).then(|| (x, y - 1)), (y + 1 < h).then(|| (x, y + 1))]
+            };
+            let (mut sum, mut weight) = ([f64::from(p[0]), f64::from(p[1]), f64::from(p[2])], 1.0);
+            for q in near.into_iter().flatten().filter_map(|(x, y)| px(x, y)).filter(|q| q[3] >= 128) {
+                let d2: f64 = (0..3).map(|k| (f64::from(q[k]) - f64::from(p[k])).powi(2)).sum();
+                let wt = 1.0 / (1.0 + d2 / (ALIKE * ALIKE)).powi(2);
+                for k in 0..3 {
+                    sum[k] += wt * f64::from(q[k]);
+                }
+                weight += wt;
+            }
+            out.extend(sum.map(|v| (v / weight).round() as u8));
+            out.push(p[3]);
+        }
+        out
+    });
+    done.concat()
+}
+
+/// `img` with the noise within its tones smoothed away and its edges kept.
+pub(crate) fn smoothed(img: &Raster) -> Raster {
+    let (w, h) = (img.width as usize, img.height as usize);
+    let mut rgba = img.rgba.clone();
+    if rgba.len() == w * h * 4 {
+        for _ in 0..3 {
+            rgba = pass(&pass(&rgba, w, h, true), w, h, false);
+        }
+    }
+    Raster { width: img.width, height: img.height, rgba }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn noise_goes_and_an_edge_stays() {
+        // Left half about 60, right half about 160, with noise of ±6 on both.
+        let img = Raster::from_fn(40, 20, |x, y| {
+            let mut n = x.wrapping_mul(0x9E37_79B1) ^ y.wrapping_mul(0x85EB_CA77);
+            n ^= n >> 15;
+            n = n.wrapping_mul(0x2C1B_3C6D);
+            let n = ((n >> 12) % 13) as u8;
+            let v = if x < 20 { 54 + n } else { 154 + n };
+            [v, v, v, 255]
+        });
+        let out = smoothed(&img);
+        let spread = |r: &Raster, x0: u32, x1: u32| {
+            let v: Vec<u8> = (0..20).flat_map(|y| (x0..x1).map(move |x| (x, y))).map(|(x, y)| r.pixel(x, y)[0]).collect();
+            v.iter().max().unwrap() - v.iter().min().unwrap()
+        };
+        assert_eq!(spread(&img, 0, 20), 12);
+        assert!(spread(&out, 0, 20) <= 6 && spread(&out, 20, 40) <= 6, "{} {}", spread(&out, 0, 20), spread(&out, 20, 40));
+        // The edge is still one pixel sharp, where it was.
+        assert!(out.pixel(19, 10)[0] < 70 && out.pixel(20, 10)[0] > 150);
+    }
+
+    #[test]
+    fn transparent_pixels_and_odd_sizes_pass_through() {
+        let img = Raster::from_fn(3, 1, |x, _| [10 * x as u8, 0, 0, if x == 1 { 0 } else { 255 }]);
+        let out = smoothed(&img);
+        assert_eq!(out.pixel(1, 0), [10, 0, 0, 0]);
+        assert_eq!((out.width, out.height, out.rgba.len()), (3, 1, 12));
+        let broken = Raster { width: 4, height: 4, rgba: vec![0; 7] };
+        assert_eq!(smoothed(&broken).rgba.len(), 7);
+    }
+}

crates/trace/src/tests.rs

@@ -944,3 +944,45 @@ fn the_bands_of_a_gradient_stay_apart() {
     });
     assert!(quantize(&noisy, &sixteen_colors()).palette.len() >= 12);
 }
+
+#[test]
+fn a_noisy_gradient_keeps_its_tones_without_specks() {
+    // Tones 0–255 across with noise larger than High Fidelity Photo's 64 steps are apart.
+    let img = Raster::from_fn(256, 96, |x, y| {
+        let c = |k: u32| (f64::from(x) + 5.0 * jitter(x, y, k)).round().clamp(0.0, 255.0) as u8;
+        [c(0), c(1), c(2), 255]
+    });
+    let params = preset("High Fidelity Photo").unwrap();
+    let res = trace(&img, &params);
+    // Smoothed first, the noise mixes fewer neighbouring tones into one (`quantize` alone works
+    // on the picture as it is), and leaves no specks.
+    let unsmoothed = quantize(&img, &params).palette.len();
+    assert!(res.palette.len() > unsmoothed && res.palette.len() >= 24, "{} colours, {unsmoothed} unsmoothed", res.palette.len());
+    assert!(res.paths.len() <= 2 * res.palette.len(), "{} paths of {} colours", res.paths.len(), res.palette.len());
+}
+
+#[test]
+fn stacked_layers_go_by_lightness_and_leave_ignored_white_alone() {
+    // Stripes: black, white, mid gray, light gray (the widest).
+    let img = Raster::from_fn(100, 20, |x, _| {
+        let v = match x {
+            0..20 => 0,
+            20..40 => 255,
+            40..60 => 120,
+            _ => 200,
+        };
+        [v, v, v, 255]
+    });
+    let params = TraceParams { mode: Mode::Grayscale, colors: 4, noise: 0, method: Method::Overlapping, ..TraceParams::default() };
+    let tones = |res: &TraceResult| res.paths.iter().map(|p| p.color[0]).collect::<Vec<u8>>();
+    // The largest colour is light, so the stack starts at the light end.
+    // (Each layer reaches under those above it: under the black stripe too, a part of its own.)
+    assert_eq!(tones(&trace(&img, &params)), [255, 200, 200, 120, 120, 0]);
+    // Without white, no layer reaches under where it was.
+    let res = trace(&img, &TraceParams { ignore_white: true, ..params });
+    assert_eq!(tones(&res), [200, 200, 120, 120, 0]);
+    for p in &res.paths {
+        let b = p.path.bounds().unwrap();
+        assert!(b.x1 <= 20.5 || b.x0 >= 39.5, "a {} layer covers the white stripe: {b:?}", p.color[0]);
+    }
+}

docs/image-trace-quality.md

@@ -1,6 +1,6 @@
 # Image Trace quality
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (the palette: 16 Colors on flat art 70 to 4.2 paths, High Fidelity Photo 3,636 to 639)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (photos: High Fidelity Photo 3,653 paths to 121 with its colour error down from 2.30 to 1.75)
 
 What Image Trace (`crates/trace`) makes of images whose right answer is known, measured by a harness and
 compared with the numbers before each change. Nothing here is a judgement by eye, and nothing is compared
@@ -72,17 +72,17 @@ Each preset on the inputs it is meant for, all sizes and variants.
 | Technical Drawing | polygons, star, letter A, lines | 2.66 | 13.45 | 0.201 | 1.37 | 105.76 | 4.8 | 32 | 2.23 | 100 | 85 | 5.9 | – | – | – | – | 0.1 | 0.0 |
 | Flat Logo | two touching halves, four-colour badge | 0.43 | 3.53 | 3.106 | 88.50 | 0.78 | 69.9 | 352 | 38.92 | 38 | 80 | 237.0 | 0.0 | 0 | 13.8 | – | 59.1 | 0.2 |
 
-### Now (sub-pixel edges and the palette)
+### Now (sub-pixel edges, the palette, photo smoothing)
 
 | preset | inputs | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
 | Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.12 | 0.091 | 1.02 | 2.17 | 1.9 | 18 | 1.81 | 29 | 68 | 0.4 | – | – | 22.2 | 22.4 | 0.0 | 0.0 |
-| High Fidelity Photo | gradient, photo-like | 2.37 | 2.59 | – | – | – | 638.7 | 25604 | – | 29 | – | – | – | – | 0.0 | – | 151.5 | 0.5 |
-| Low Fidelity Photo | gradient, photo-like | 2.67 | 2.93 | – | – | – | 55.3 | 5019 | – | 36 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| High Fidelity Photo | gradient, photo-like | 1.75 | 1.98 | – | – | – | 120.7 | 9818 | – | 43 | – | – | – | – | 0.0 | – | 10.3 | 0.1 |
+| Low Fidelity Photo | gradient, photo-like | 2.45 | 2.69 | – | – | – | 37.1 | 2132 | – | 44 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
 | 3 Colors | two touching halves | 0.43 | 4.32 | 0.087 | 0.74 | 0.56 | 2.0 | 9 | 1.57 | 39 | 100 | 0.0 | 0.0 | 0 | 48.6 | 29.4 | 0.0 | 0.0 |
 | 6 Colors | two touching halves, four-colour badge | 0.56 | 5.01 | 0.137 | 1.09 | 1.14 | 4.0 | 50 | 3.15 | 40 | 88 | 3.6 | 0.0 | 0 | 39.0 | 35.7 | 0.0 | 0.0 |
 | 16 Colors | two touching halves, four-colour badge | 0.55 | 4.89 | 0.133 | 1.09 | 1.15 | 4.2 | 66 | 3.97 | 41 | 88 | 4.4 | 0.0 | 0 | 34.5 | 26.4 | 0.0 | 0.0 |
-| Shades of Gray | gradient, photo-like | 9.33 | 9.15 | – | – | – | 72.8 | 2681 | – | 50 | – | – | – | – | 0.0 | – | 1.9 | 0.8 |
+| Shades of Gray | gradient, photo-like | 9.26 | 9.06 | – | – | – | 16.5 | 879 | – | 53 | – | – | – | – | 0.0 | – | 0.4 | 0.8 |
 | Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.39 | 0.064 | 1.00 | 2.18 | 1.4 | 27 | 2.73 | 40 | 67 | 0.3 | – | – | – | – | 0.0 | 0.0 |
 | Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 12.11 | 0.195 | 1.00 | 105.54 | 1.8 | 17 | 1.49 | 16 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.28 | 0.532 | 2.24 | 2.24 | 1.2 | 14 | 1.65 | 12 | 79 | 0.1 | – | – | – | – | 0.0 | 0.0 |
@@ -90,7 +90,7 @@ Each preset on the inputs it is meant for, all sizes and variants.
 | Technical Drawing | polygons, star, letter A, lines | 2.53 | 9.47 | 0.086 | 0.99 | 105.85 | 4.8 | 57 | 3.73 | 69 | 74 | 0.7 | – | – | – | – | 0.3 | 0.0 |
 | Flat Logo | two touching halves, four-colour badge | 0.43 | 3.53 | 3.106 | 88.50 | 0.78 | 69.9 | 352 | 38.92 | 38 | 80 | 237.0 | 0.0 | 0 | 13.8 | – | 59.1 | 0.2 |
 
-The sections below are the numbers now (sub-pixel edges and the palette).
+The sections below are the numbers now (sub-pixel edges, the palette, photo smoothing).
 
 ## 1. Each preset on the inputs it is meant for
 
@@ -99,12 +99,12 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | preset | inputs | ΔE | edge ΔE | off mean | off max | missed max | paths | anchors | × art | lines % | corners % | kinks | odd colours | odd px | gap px | overlap px | specks | outside px |
 |:--|:--|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
 | Default | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.60 | 10.12 | 0.091 | 1.02 | 2.17 | 1.9 | 18 | 1.81 | 29 | 68 | 0.4 | – | – | 22.2 | 22.4 | 0.0 | 0.0 |
-| High Fidelity Photo | gradient, photo-like | 2.37 | 2.59 | – | – | – | 638.7 | 25604 | – | 29 | – | – | – | – | 0.0 | – | 151.5 | 0.5 |
-| Low Fidelity Photo | gradient, photo-like | 2.67 | 2.93 | – | – | – | 55.3 | 5019 | – | 36 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| High Fidelity Photo | gradient, photo-like | 1.75 | 1.98 | – | – | – | 120.7 | 9818 | – | 43 | – | – | – | – | 0.0 | – | 10.3 | 0.1 |
+| Low Fidelity Photo | gradient, photo-like | 2.45 | 2.69 | – | – | – | 37.1 | 2132 | – | 44 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
 | 3 Colors | two touching halves | 0.43 | 4.32 | 0.087 | 0.74 | 0.56 | 2.0 | 9 | 1.57 | 39 | 100 | 0.0 | 0.0 | 0 | 48.6 | 29.4 | 0.0 | 0.0 |
 | 6 Colors | two touching halves, four-colour badge | 0.56 | 5.01 | 0.137 | 1.09 | 1.14 | 4.0 | 50 | 3.15 | 40 | 88 | 3.6 | 0.0 | 0 | 39.0 | 35.7 | 0.0 | 0.0 |
 | 16 Colors | two touching halves, four-colour badge | 0.55 | 4.89 | 0.133 | 1.09 | 1.15 | 4.2 | 66 | 3.97 | 41 | 88 | 4.4 | 0.0 | 0 | 34.5 | 26.4 | 0.0 | 0.0 |
-| Shades of Gray | gradient, photo-like | 9.33 | 9.15 | – | – | – | 72.8 | 2681 | – | 50 | – | – | – | – | 0.0 | – | 1.9 | 0.8 |
+| Shades of Gray | gradient, photo-like | 9.26 | 9.06 | – | – | – | 16.5 | 879 | – | 53 | – | – | – | – | 0.0 | – | 0.4 | 0.8 |
 | Black and White Logo | circle, ellipses, badge with a hole, letter D, polygons, star, letter A | 2.58 | 9.39 | 0.064 | 1.00 | 2.18 | 1.4 | 27 | 2.73 | 40 | 67 | 0.3 | – | – | – | – | 0.0 | 0.0 |
 | Sketched Art | circle, ellipses, badge with a hole, letter D, lines | 2.71 | 12.11 | 0.195 | 1.00 | 105.54 | 1.8 | 17 | 1.49 | 16 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Silhouettes | circle, ellipses, badge with a hole, letter D | 2.98 | 19.28 | 0.532 | 2.24 | 2.24 | 1.2 | 14 | 1.65 | 12 | 79 | 0.1 | – | – | – | – | 0.0 | 0.0 |
@@ -123,34 +123,34 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | Default | gradient, photo | 39.13 | 38.78 | – | – | – | 3.2 | 698 | – | 57 | – | – | – | – | 31.2 | 40.7 | 0.0 | 0.3 |
 | High Fidelity Photo | curved shapes | 0.04 | 1.74 | 0.026 | 0.16 | 0.16 | 1.2 | 20 | 2.17 | 21 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
 | High Fidelity Photo | polygons | 0.05 | 1.92 | 0.031 | 0.51 | 1.34 | 1.7 | 17 | 1.50 | 87 | 88 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
-| High Fidelity Photo | thin lines | 0.17 | 2.58 | 0.135 | 0.85 | 4.31 | 33.3 | 264 | 13.20 | 46 | – | – | 20.7 | 425 | 0.0 | – | 3.3 | 0.0 |
-| High Fidelity Photo | flat colour art | 0.08 | 2.31 | 0.033 | 0.20 | 0.20 | 4.0 | 31 | 2.50 | 38 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
-| High Fidelity Photo | gradient, photo | 2.46 | 2.67 | – | – | – | 428.3 | 22245 | – | 30 | – | – | – | – | 0.0 | – | 54.5 | 0.3 |
+| High Fidelity Photo | thin lines | 0.34 | 6.00 | 0.076 | 0.85 | 4.31 | 40.3 | 333 | 16.67 | 37 | – | – | 27.3 | 4489 | 0.0 | – | 19.0 | 0.0 |
+| High Fidelity Photo | flat colour art | 0.14 | 4.17 | 0.028 | 0.20 | 0.20 | 3.5 | 71 | 4.44 | 35 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
+| High Fidelity Photo | gradient, photo | 1.80 | 2.05 | – | – | – | 134.7 | 11186 | – | 43 | – | – | – | – | 0.0 | – | 7.7 | 0.1 |
 | Low Fidelity Photo | curved shapes | 0.06 | 2.65 | 0.045 | 0.27 | 0.27 | 1.2 | 14 | 1.53 | 19 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
 | Low Fidelity Photo | polygons | 0.06 | 2.25 | 0.037 | 0.51 | 1.34 | 1.7 | 14 | 1.25 | 86 | 88 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
-| Low Fidelity Photo | thin lines | 0.47 | 4.44 | 0.140 | 0.86 | 45.38 | 5.0 | 37 | 1.85 | 61 | – | – | 1.0 | 265 | 0.0 | – | 0.0 | 0.0 |
-| Low Fidelity Photo | flat colour art | 0.09 | 2.61 | 0.048 | 0.27 | 0.27 | 4.0 | 25 | 1.88 | 36 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
-| Low Fidelity Photo | gradient, photo | 2.77 | 3.04 | – | – | – | 52.7 | 5273 | – | 35 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| Low Fidelity Photo | thin lines | 0.51 | 5.73 | 0.081 | 0.86 | 45.38 | 7.0 | 56 | 2.80 | 47 | – | – | 4.0 | 3974 | 0.0 | – | 0.0 | 0.0 |
+| Low Fidelity Photo | flat colour art | 0.15 | 4.33 | 0.046 | 0.27 | 0.27 | 3.5 | 55 | 3.38 | 32 | 100 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
+| Low Fidelity Photo | gradient, photo | 2.53 | 2.80 | – | – | – | 42.7 | 2289 | – | 43 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
 | 3 Colors | curved shapes | 0.06 | 2.65 | 0.046 | 0.33 | 0.24 | 1.8 | 16 | 1.77 | 16 | 100 | 0.0 | 0.0 | 0 | 18.7 | 15.2 | 0.0 | 0.0 |
 | 3 Colors | polygons | 0.06 | 2.25 | 0.037 | 0.51 | 1.34 | 2.0 | 15 | 1.35 | 86 | 88 | 0.0 | 0.0 | 0 | 5.1 | 4.7 | 0.0 | 0.0 |
 | 3 Colors | thin lines | 0.44 | 4.40 | 0.107 | 0.90 | 45.38 | 5.0 | 44 | 2.22 | 49 | – | – | 2.0 | 290 | 23.8 | 27.4 | 0.0 | 0.0 |
 | 3 Colors | flat colour art | 1.32 | 3.85 | 0.113 | 0.90 | 60.22 | 2.5 | 24 | 1.77 | 46 | 100 | 0.0 | 1.0 | 9919 | 30.3 | 31.0 | 0.0 | 0.0 |
-| 3 Colors | gradient, photo | 7.49 | 7.60 | – | – | – | 5.0 | 801 | – | 50 | – | – | – | – | 30.2 | 45.2 | 0.0 | 0.2 |
+| 3 Colors | gradient, photo | 7.49 | 7.60 | – | – | – | 5.7 | 532 | – | 48 | – | – | – | – | 25.5 | 26.9 | 0.0 | 0.2 |
 | 6 Colors | curved shapes | 0.06 | 2.38 | 0.042 | 0.28 | 0.24 | 1.8 | 17 | 1.86 | 17 | 100 | 0.0 | 0.0 | 0 | 17.9 | 14.3 | 0.0 | 0.0 |
 | 6 Colors | polygons | 0.05 | 2.07 | 0.034 | 0.51 | 1.34 | 2.0 | 16 | 1.42 | 86 | 88 | 0.0 | 0.0 | 0 | 3.9 | 3.9 | 0.0 | 0.0 |
 | 6 Colors | thin lines | 0.50 | 4.54 | 0.096 | 0.86 | 45.38 | 4.0 | 32 | 1.60 | 53 | – | – | 1.7 | 398 | 18.5 | 22.8 | 0.0 | 0.0 |
 | 6 Colors | flat colour art | 0.12 | 2.66 | 0.044 | 0.25 | 0.20 | 3.0 | 28 | 2.00 | 43 | 100 | 0.0 | 0.0 | 0 | 21.9 | 21.2 | 0.0 | 0.0 |
-| 6 Colors | gradient, photo | 5.03 | 5.30 | – | – | – | 20.7 | 1735 | – | 40 | – | – | – | – | 61.6 | 102.9 | 0.0 | 0.2 |
+| 6 Colors | gradient, photo | 5.01 | 5.30 | – | – | – | 13.0 | 833 | – | 36 | – | – | – | – | 42.6 | 37.0 | 0.0 | 0.2 |
 | 16 Colors | curved shapes | 0.05 | 2.26 | 0.038 | 0.26 | 0.23 | 1.8 | 18 | 1.93 | 17 | 100 | 0.0 | 0.0 | 0 | 14.9 | 12.5 | 0.0 | 0.0 |
 | 16 Colors | polygons | 0.05 | 2.02 | 0.034 | 0.51 | 1.34 | 2.0 | 16 | 1.44 | 86 | 88 | 0.0 | 0.0 | 0 | 3.3 | 4.2 | 0.0 | 0.0 |
 | 16 Colors | thin lines | 0.41 | 3.87 | 0.103 | 0.86 | 23.65 | 8.7 | 50 | 2.52 | 51 | – | – | 5.7 | 305 | 18.4 | 25.4 | 0.0 | 0.0 |
 | 16 Colors | flat colour art | 0.12 | 2.53 | 0.041 | 0.24 | 0.20 | 3.0 | 28 | 2.07 | 44 | 100 | 0.0 | 0.0 | 0 | 19.8 | 19.5 | 0.0 | 0.0 |
-| 16 Colors | gradient, photo | 3.12 | 3.44 | – | – | – | 50.7 | 3313 | – | 34 | – | – | – | – | 121.9 | 183.8 | 0.0 | 0.2 |
+| 16 Colors | gradient, photo | 3.02 | 3.33 | – | – | – | 47.2 | 2154 | – | 29 | – | – | – | – | 89.7 | 80.2 | 0.2 | 0.2 |
 | Shades of Gray | curved shapes | 0.06 | 2.72 | 0.046 | 0.48 | 0.65 | 1.2 | 14 | 1.56 | 18 | 92 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
 | Shades of Gray | polygons | 0.05 | 1.97 | 0.033 | 0.42 | 1.26 | 1.7 | 14 | 1.21 | 89 | 91 | 0.0 | 0.0 | 0 | 0.0 | – | 0.0 | 0.0 |
-| Shades of Gray | thin lines | 0.49 | 4.80 | 0.142 | 0.86 | 45.38 | 9.0 | 54 | 2.70 | 63 | – | – | 6.0 | 472 | 0.0 | – | 0.0 | 0.0 |
-| Shades of Gray | flat colour art | 7.34 | 10.80 | 0.384 | 1.40 | 179.38 | 12.5 | 108 | 9.54 | 43 | 50 | 30.0 | 11.2 | 39147 | 0.0 | – | 0.0 | 0.0 |
-| Shades of Gray | gradient, photo | 9.73 | 9.61 | – | – | – | 81.8 | 3187 | – | 51 | – | – | – | – | 0.0 | – | 2.2 | 0.8 |
+| Shades of Gray | thin lines | 0.56 | 6.69 | 0.078 | 0.86 | 45.38 | 10.3 | 71 | 3.57 | 49 | – | – | 8.0 | 4283 | 0.0 | – | 0.0 | 0.0 |
+| Shades of Gray | flat colour art | 7.33 | 11.25 | 0.264 | 1.47 | 179.38 | 4.7 | 214 | 19.86 | 24 | 50 | 0.3 | 3.7 | 173356 | 0.0 | – | 0.0 | 0.0 |
+| Shades of Gray | gradient, photo | 9.71 | 9.55 | – | – | – | 18.2 | 955 | – | 53 | – | – | – | – | 0.0 | – | 0.5 | 0.8 |
 | Black and White Logo | curved shapes | 0.04 | 1.52 | 0.024 | 0.50 | 0.60 | 1.2 | 21 | 2.25 | 21 | 75 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Black and White Logo | polygons | 0.04 | 1.83 | 0.030 | 0.45 | 1.23 | 1.7 | 15 | 1.34 | 89 | 90 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Black and White Logo | thin lines | 0.50 | 4.22 | 0.065 | 0.50 | 77.21 | 10.3 | 66 | 3.30 | 65 | – | – | – | – | – | – | 0.0 | 0.0 |
@@ -191,16 +191,16 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | Default | blurred | 0.82 | 16.65 | 0.078 | 0.86 | 2.17 | 1.9 | 26 | 2.50 | 7 | 19 | 1.6 | – | – | 23.0 | 23.6 | 0.0 | 0.0 |
 | Default | noisy | 1.74 | 4.55 | 0.052 | 0.57 | 1.23 | 1.9 | 16 | 1.64 | 38 | 67 | 0.0 | – | – | 16.2 | 15.1 | 0.0 | 0.0 |
 | Default | scanned | 15.06 | 20.24 | 0.134 | 0.87 | 2.17 | 1.9 | 26 | 2.53 | 0 | 25 | 1.0 | – | – | 20.8 | 24.7 | 0.0 | 0.0 |
-| High Fidelity Photo | clean | 2.46 | 2.67 | – | – | – | 428.3 | 22245 | – | 30 | – | – | – | – | 0.0 | – | 54.5 | 0.3 |
-| High Fidelity Photo | aliased | 2.32 | 2.54 | – | – | – | 239.0 | 15797 | – | 28 | – | – | – | – | 0.0 | – | 25.5 | 0.3 |
-| High Fidelity Photo | blurred | 1.84 | 2.29 | – | – | – | 406.0 | 23561 | – | 24 | – | – | – | – | 0.0 | – | 39.0 | 0.1 |
-| High Fidelity Photo | noisy | 2.84 | 3.01 | – | – | – | 1455.0 | 39709 | – | 20 | – | – | – | – | 0.0 | – | 479.0 | 0.5 |
-| High Fidelity Photo | scanned | 2.19 | 2.29 | – | – | – | 1086.0 | 33427 | – | 38 | – | – | – | – | 0.0 | – | 353.5 | 0.3 |
-| Low Fidelity Photo | clean | 2.77 | 3.04 | – | – | – | 52.7 | 5273 | – | 35 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
-| Low Fidelity Photo | aliased | 2.83 | 3.08 | – | – | – | 64.0 | 3798 | – | 36 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
-| Low Fidelity Photo | blurred | 2.47 | 2.92 | – | – | – | 40.5 | 3229 | – | 31 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
-| Low Fidelity Photo | noisy | 2.99 | 3.17 | – | – | – | 72.5 | 6536 | – | 38 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
-| Low Fidelity Photo | scanned | 2.09 | 2.19 | – | – | – | 52.0 | 5754 | – | 41 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| High Fidelity Photo | clean | 1.80 | 2.05 | – | – | – | 134.7 | 11186 | – | 43 | – | – | – | – | 0.0 | – | 7.7 | 0.1 |
+| High Fidelity Photo | aliased | 1.78 | 2.01 | – | – | – | 73.0 | 7695 | – | 45 | – | – | – | – | 0.0 | – | 5.5 | 0.1 |
+| High Fidelity Photo | blurred | 1.59 | 1.95 | – | – | – | 72.0 | 7184 | – | 45 | – | – | – | – | 0.0 | – | 0.5 | 0.1 |
+| High Fidelity Photo | noisy | 2.02 | 2.19 | – | – | – | 155.5 | 10562 | – | 38 | – | – | – | – | 0.0 | – | 18.5 | 0.1 |
+| High Fidelity Photo | scanned | 1.45 | 1.55 | – | – | – | 140.5 | 9726 | – | 41 | – | – | – | – | 0.0 | – | 24.5 | 0.1 |
+| Low Fidelity Photo | clean | 2.53 | 2.80 | – | – | – | 42.7 | 2289 | – | 43 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| Low Fidelity Photo | aliased | 2.53 | 2.78 | – | – | – | 36.5 | 1504 | – | 46 | – | – | – | – | 0.0 | – | 0.0 | 0.1 |
+| Low Fidelity Photo | blurred | 2.35 | 2.75 | – | – | – | 29.0 | 2004 | – | 45 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| Low Fidelity Photo | noisy | 2.70 | 2.85 | – | – | – | 32.0 | 1960 | – | 46 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| Low Fidelity Photo | scanned | 1.95 | 2.05 | – | – | – | 34.5 | 2588 | – | 42 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
 | 3 Colors | clean | 0.07 | 2.53 | 0.051 | 0.24 | 0.14 | 2.0 | 10 | 1.61 | 39 | 100 | 0.0 | 0.0 | 0 | 40.0 | 25.5 | 0.0 | 0.0 |
 | 3 Colors | aliased | 0.18 | 9.81 | 0.236 | 0.74 | 0.56 | 2.0 | 7 | 1.17 | 39 | 100 | 0.0 | 0.0 | 0 | 123.2 | 82.4 | 0.0 | 0.0 |
 | 3 Colors | blurred | 0.33 | 7.80 | 0.088 | 0.21 | 0.16 | 2.0 | 10 | 1.67 | 39 | 100 | 0.0 | 0.0 | 0 | 29.7 | 18.6 | 0.0 | 0.0 |
@@ -216,11 +216,11 @@ All sizes and variants (clean, aliased, blurred, noisy, scanned) of those inputs
 | 16 Colors | blurred | 0.62 | 9.37 | 0.250 | 1.08 | 1.15 | 7.0 | 157 | 8.43 | 44 | 50 | 11.5 | 0.0 | 0 | 27.8 | 38.2 | 0.0 | 0.0 |
 | 16 Colors | noisy | 0.85 | 2.34 | 0.042 | 0.27 | 0.22 | 3.0 | 32 | 2.27 | 34 | 100 | 0.0 | 0.0 | 0 | 23.4 | 15.6 | 0.0 | 0.0 |
 | 16 Colors | scanned | 1.74 | 4.56 | 0.243 | 1.09 | 0.96 | 7.5 | 156 | 8.53 | 32 | 62 | 19.0 | 0.0 | 0 | 53.3 | 20.8 | 0.0 | 0.0 |
-| Shades of Gray | clean | 9.73 | 9.61 | – | – | – | 81.8 | 3187 | – | 51 | – | – | – | – | 0.0 | – | 2.2 | 0.8 |
-| Shades of Gray | aliased | 9.73 | 9.58 | – | – | – | 80.0 | 2429 | – | 54 | – | – | – | – | 0.0 | – | 3.0 | 0.8 |
-| Shades of Gray | blurred | 9.69 | 9.39 | – | – | – | 62.0 | 1644 | – | 50 | – | – | – | – | 0.0 | – | 1.0 | 0.7 |
-| Shades of Gray | noisy | 9.79 | 9.50 | – | – | – | 72.5 | 2703 | – | 50 | – | – | – | – | 0.0 | – | 2.0 | 0.2 |
-| Shades of Gray | scanned | 6.87 | 6.77 | – | – | – | 49.5 | 2430 | – | 44 | – | – | – | – | 0.0 | – | 1.0 | 0.2 |
+| Shades of Gray | clean | 9.71 | 9.55 | – | – | – | 18.2 | 955 | – | 53 | – | – | – | – | 0.0 | – | 0.5 | 0.8 |
+| Shades of Gray | aliased | 9.70 | 9.52 | – | – | – | 11.0 | 788 | – | 58 | – | – | – | – | 0.0 | – | 0.5 | 0.7 |
+| Shades of Gray | blurred | 9.66 | 9.32 | – | – | – | 11.5 | 729 | – | 56 | – | – | – | – | 0.0 | – | 0.5 | 0.7 |
+| Shades of Gray | noisy | 9.74 | 9.44 | – | – | – | 19.5 | 823 | – | 47 | – | – | – | – | 0.0 | – | 0.0 | 0.2 |
+| Shades of Gray | scanned | 6.58 | 6.46 | – | – | – | 19.0 | 947 | – | 49 | – | – | – | – | 0.0 | – | 0.5 | 0.2 |
 | Black and White Logo | clean | 0.04 | 1.65 | 0.027 | 0.50 | 1.23 | 1.4 | 18 | 1.86 | 50 | 86 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Black and White Logo | aliased | 0.39 | 20.41 | 0.176 | 1.00 | 1.34 | 1.4 | 24 | 2.47 | 53 | 98 | 0.0 | – | – | – | – | 0.0 | 0.0 |
 | Black and White Logo | blurred | 0.81 | 16.37 | 0.047 | 0.80 | 2.18 | 1.4 | 39 | 3.78 | 23 | 19 | 1.0 | – | – | – | – | 0.0 | 0.0 |
@@ -284,18 +284,18 @@ One trace at a time on this machine (all cores); memory is the peak allocated ab
 |:--|:--|--:|:--|
 | Default | photo-like | 1 | 0.05 s, 29 paths, 7947 anchors, 15 MB |
 | Default | four-colour badge | 1 | 0.03 s, 3 paths, 106 anchors, 15 MB |
-| High Fidelity Photo | photo-like | 1 | 0.42 s, 4298 paths, 260070 anchors, 143 MB |
-| High Fidelity Photo | four-colour badge | 1 | 0.05 s, 7 paths, 66 anchors, 34 MB |
-| Low Fidelity Photo | photo-like | 1 | 0.14 s, 245 paths, 52047 anchors, 118 MB |
-| Low Fidelity Photo | four-colour badge | 1 | 0.05 s, 7 paths, 54 anchors, 34 MB |
-| 3 Colors | photo-like | 1 | 0.07 s, 11 paths, 7582 anchors, 22 MB |
-| 3 Colors | four-colour badge | 1 | 0.04 s, 4 paths, 79 anchors, 21 MB |
-| 6 Colors | photo-like | 1 | 0.09 s, 143 paths, 20207 anchors, 38 MB |
+| High Fidelity Photo | photo-like | 1 | 0.25 s, 968 paths, 113205 anchors, 238 MB |
+| High Fidelity Photo | four-colour badge | 1 | 0.06 s, 6 paths, 192 anchors, 34 MB |
+| Low Fidelity Photo | photo-like | 1 | 0.13 s, 129 paths, 22788 anchors, 141 MB |
+| Low Fidelity Photo | four-colour badge | 1 | 0.05 s, 6 paths, 144 anchors, 36 MB |
+| 3 Colors | photo-like | 1 | 0.07 s, 9 paths, 3391 anchors, 26 MB |
+| 3 Colors | four-colour badge | 1 | 0.05 s, 4 paths, 79 anchors, 21 MB |
+| 6 Colors | photo-like | 1 | 0.08 s, 78 paths, 9239 anchors, 42 MB |
 | 6 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 89 anchors, 33 MB |
-| 16 Colors | photo-like | 1 | 0.12 s, 403 paths, 39143 anchors, 95 MB |
+| 16 Colors | photo-like | 1 | 0.11 s, 178 paths, 21069 anchors, 102 MB |
 | 16 Colors | four-colour badge | 1 | 0.05 s, 5 paths, 92 anchors, 33 MB |
-| Shades of Gray | photo-like | 1 | 0.12 s, 447 paths, 31045 anchors, 53 MB |
-| Shades of Gray | four-colour badge | 1 | 0.05 s, 36 paths, 292 anchors, 51 MB |
+| Shades of Gray | photo-like | 1 | 0.09 s, 82 paths, 8511 anchors, 65 MB |
+| Shades of Gray | four-colour badge | 1 | 0.06 s, 10 paths, 780 anchors, 56 MB |
 | Black and White Logo | photo-like | 1 | 0.05 s, 71 paths, 9067 anchors, 9 MB |
 | Black and White Logo | four-colour badge | 1 | 0.02 s, 1 paths, 58 anchors, 8 MB |
 | Sketched Art | photo-like | 1 | 0.05 s, 5 paths, 3207 anchors, 9 MB |
@@ -307,64 +307,65 @@ One trace at a time on this machine (all cores); memory is the peak allocated ab
 | Technical Drawing | photo-like | 1 | 0.06 s, 221 paths, 10646 anchors, 9 MB |
 | Technical Drawing | four-colour badge | 1 | 0.02 s, 1 paths, 58 anchors, 8 MB |
 | Flat Logo | photo-like | 1 | refused after 0.09 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 1 | 0.65 s, 5 paths, 78 anchors, 146 MB |
-| Default | photo-like | 4 | 0.21 s, 48 paths, 20717 anchors, 60 MB |
+| Flat Logo | four-colour badge | 1 | 0.64 s, 5 paths, 78 anchors, 146 MB |
+| Default | photo-like | 4 | 0.19 s, 48 paths, 20717 anchors, 60 MB |
 | Default | four-colour badge | 4 | 0.10 s, 3 paths, 148 anchors, 64 MB |
-| High Fidelity Photo | photo-like | 4 | 1.75 s, 27583 paths, 1089750 anchors, 784 MB |
-| High Fidelity Photo | four-colour badge | 4 | 0.22 s, 7 paths, 93 anchors, 126 MB |
-| Low Fidelity Photo | photo-like | 4 | 0.46 s, 764 paths, 138552 anchors, 469 MB |
-| Low Fidelity Photo | four-colour badge | 4 | 0.22 s, 7 paths, 74 anchors, 126 MB |
-| 3 Colors | photo-like | 4 | 0.27 s, 22 paths, 16576 anchors, 88 MB |
-| 3 Colors | four-colour badge | 4 | 0.17 s, 4 paths, 122 anchors, 84 MB |
-| 6 Colors | photo-like | 4 | 0.30 s, 358 paths, 54088 anchors, 153 MB |
-| 6 Colors | four-colour badge | 4 | 0.18 s, 5 paths, 116 anchors, 128 MB |
-| 16 Colors | photo-like | 4 | 0.41 s, 1475 paths, 113487 anchors, 393 MB |
-| 16 Colors | four-colour badge | 4 | 0.17 s, 5 paths, 124 anchors, 128 MB |
-| Shades of Gray | photo-like | 4 | 0.38 s, 1289 paths, 83191 anchors, 212 MB |
-| Shades of Gray | four-colour badge | 4 | 0.25 s, 37 paths, 428 anchors, 197 MB |
-| Black and White Logo | photo-like | 4 | 0.22 s, 208 paths, 25916 anchors, 36 MB |
-| Black and White Logo | four-colour badge | 4 | 0.09 s, 1 paths, 64 anchors, 36 MB |
-| Sketched Art | photo-like | 4 | 0.22 s, 9 paths, 6875 anchors, 36 MB |
-| Sketched Art | four-colour badge | 4 | 0.09 s, 2 paths, 279 anchors, 36 MB |
+| High Fidelity Photo | photo-like | 4 | 0.88 s, 4475 paths, 344985 anchors, 964 MB |
+| High Fidelity Photo | four-colour badge | 4 | 0.22 s, 6 paths, 216 anchors, 152 MB |
+| Low Fidelity Photo | photo-like | 4 | 0.38 s, 304 paths, 61608 anchors, 592 MB |
+| Low Fidelity Photo | four-colour badge | 4 | 0.23 s, 6 paths, 169 anchors, 152 MB |
+| 3 Colors | photo-like | 4 | 0.28 s, 20 paths, 8647 anchors, 104 MB |
+| 3 Colors | four-colour badge | 4 | 0.18 s, 4 paths, 122 anchors, 84 MB |
+| 6 Colors | photo-like | 4 | 0.27 s, 115 paths, 24075 anchors, 165 MB |
+| 6 Colors | four-colour badge | 4 | 0.19 s, 5 paths, 116 anchors, 128 MB |
+| 16 Colors | photo-like | 4 | 0.33 s, 353 paths, 54215 anchors, 380 MB |
+| 16 Colors | four-colour badge | 4 | 0.18 s, 5 paths, 124 anchors, 128 MB |
+| Shades of Gray | photo-like | 4 | 0.29 s, 137 paths, 22704 anchors, 232 MB |
+| Shades of Gray | four-colour badge | 4 | 0.27 s, 10 paths, 1234 anchors, 220 MB |
+| Black and White Logo | photo-like | 4 | 0.21 s, 208 paths, 25916 anchors, 36 MB |
+| Black and White Logo | four-colour badge | 4 | 0.08 s, 1 paths, 64 anchors, 36 MB |
+| Sketched Art | photo-like | 4 | 0.21 s, 9 paths, 6875 anchors, 36 MB |
+| Sketched Art | four-colour badge | 4 | 0.08 s, 2 paths, 279 anchors, 36 MB |
 | Silhouettes | photo-like | 4 | 0.18 s, 2 paths, 2133 anchors, 44 MB |
-| Silhouettes | four-colour badge | 4 | 0.09 s, 1 paths, 32 anchors, 36 MB |
+| Silhouettes | four-colour badge | 4 | 0.10 s, 1 paths, 32 anchors, 36 MB |
 | Line Art | photo-like | 4 | 0.21 s, 127 paths, 12595 anchors, 36 MB |
-| Line Art | four-colour badge | 4 | 0.09 s, 1 paths, 465 anchors, 36 MB |
-| Technical Drawing | photo-like | 4 | 0.23 s, 931 paths, 33946 anchors, 36 MB |
-| Technical Drawing | four-colour badge | 4 | 0.09 s, 1 paths, 64 anchors, 36 MB |
+| Line Art | four-colour badge | 4 | 0.08 s, 1 paths, 465 anchors, 36 MB |
+| Technical Drawing | photo-like | 4 | 0.22 s, 931 paths, 33946 anchors, 36 MB |
+| Technical Drawing | four-colour badge | 4 | 0.08 s, 1 paths, 64 anchors, 36 MB |
 | Flat Logo | photo-like | 4 | refused after 0.10 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 4 | 0.65 s, 5 paths, 69 anchors, 146 MB |
-| Default | photo-like | 16 | 1.13 s, 127 paths, 46199 anchors, 256 MB |
-| Default | four-colour badge | 16 | 0.51 s, 3 paths, 284 anchors, 240 MB |
-| High Fidelity Photo | photo-like | 16 | refused after 5.01 s (over 2,000,000 anchors), 3055 MB |
-| High Fidelity Photo | four-colour badge | 16 | 1.00 s, 7 paths, 100 anchors, 504 MB |
-| Low Fidelity Photo | photo-like | 16 | 1.60 s, 3759 paths, 363242 anchors, 1757 MB |
-| Low Fidelity Photo | four-colour badge | 16 | 1.01 s, 7 paths, 79 anchors, 504 MB |
-| 3 Colors | photo-like | 16 | 1.30 s, 118 paths, 41993 anchors, 352 MB |
-| 3 Colors | four-colour badge | 16 | 0.77 s, 4 paths, 179 anchors, 336 MB |
-| 6 Colors | photo-like | 16 | 1.34 s, 1677 paths, 155283 anchors, 601 MB |
-| 6 Colors | four-colour badge | 16 | 0.79 s, 5 paths, 118 anchors, 500 MB |
-| 16 Colors | photo-like | 16 | 1.73 s, 8717 paths, 394936 anchors, 1571 MB |
-| 16 Colors | four-colour badge | 16 | 0.82 s, 5 paths, 120 anchors, 512 MB |
-| Shades of Gray | photo-like | 16 | 1.50 s, 5996 paths, 256732 anchors, 789 MB |
-| Shades of Gray | four-colour badge | 16 | 1.26 s, 38 paths, 593 anchors, 692 MB |
-| Black and White Logo | photo-like | 16 | 1.16 s, 1128 paths, 77629 anchors, 144 MB |
-| Black and White Logo | four-colour badge | 16 | 0.42 s, 1 paths, 103 anchors, 128 MB |
-| Sketched Art | photo-like | 16 | 1.13 s, 15 paths, 17817 anchors, 144 MB |
-| Sketched Art | four-colour badge | 16 | 0.45 s, 2 paths, 478 anchors, 128 MB |
-| Silhouettes | photo-like | 16 | 1.37 s, 3 paths, 4891 anchors, 176 MB |
-| Silhouettes | four-colour badge | 16 | 0.54 s, 1 paths, 44 anchors, 144 MB |
-| Line Art | photo-like | 16 | 1.22 s, 713 paths, 64481 anchors, 144 MB |
+| Flat Logo | four-colour badge | 4 | 0.66 s, 5 paths, 69 anchors, 146 MB |
+| Default | photo-like | 16 | 1.08 s, 127 paths, 46199 anchors, 256 MB |
+| Default | four-colour badge | 16 | 0.46 s, 3 paths, 284 anchors, 240 MB |
+| High Fidelity Photo | photo-like | 16 | 3.48 s, 31131 paths, 1254672 anchors, 3954 MB |
+| High Fidelity Photo | four-colour badge | 16 | 1.07 s, 6 paths, 248 anchors, 576 MB |
+| Low Fidelity Photo | photo-like | 16 | 1.57 s, 2036 paths, 185091 anchors, 2050 MB |
+| Low Fidelity Photo | four-colour badge | 16 | 1.08 s, 6 paths, 188 anchors, 576 MB |
+| 3 Colors | photo-like | 16 | 1.27 s, 76 paths, 23365 anchors, 416 MB |
+| 3 Colors | four-colour badge | 16 | 0.80 s, 4 paths, 179 anchors, 336 MB |
+| 6 Colors | photo-like | 16 | 1.17 s, 470 paths, 63030 anchors, 673 MB |
+| 6 Colors | four-colour badge | 16 | 0.84 s, 5 paths, 118 anchors, 512 MB |
+| 16 Colors | photo-like | 16 | 1.30 s, 1973 paths, 149717 anchors, 1633 MB |
+| 16 Colors | four-colour badge | 16 | 0.84 s, 5 paths, 120 anchors, 504 MB |
+| Shades of Gray | photo-like | 16 | 1.32 s, 688 paths, 65052 anchors, 850 MB |
+| Shades of Gray | four-colour badge | 16 | 1.28 s, 9 paths, 2296 anchors, 800 MB |
+| Black and White Logo | photo-like | 16 | 1.04 s, 1128 paths, 77629 anchors, 144 MB |
+| Black and White Logo | four-colour badge | 16 | 0.45 s, 1 paths, 103 anchors, 128 MB |
+| Sketched Art | photo-like | 16 | 1.15 s, 15 paths, 17817 anchors, 144 MB |
+| Sketched Art | four-colour badge | 16 | 0.48 s, 2 paths, 478 anchors, 128 MB |
+| Silhouettes | photo-like | 16 | 1.40 s, 3 paths, 4891 anchors, 176 MB |
+| Silhouettes | four-colour badge | 16 | 0.55 s, 1 paths, 44 anchors, 144 MB |
+| Line Art | photo-like | 16 | 1.21 s, 713 paths, 64481 anchors, 144 MB |
 | Line Art | four-colour badge | 16 | 0.45 s, 1 paths, 786 anchors, 128 MB |
-| Technical Drawing | photo-like | 16 | 1.37 s, 4578 paths, 114292 anchors, 144 MB |
-| Technical Drawing | four-colour badge | 16 | 0.43 s, 1 paths, 103 anchors, 128 MB |
+| Technical Drawing | photo-like | 16 | 1.20 s, 4578 paths, 114292 anchors, 144 MB |
+| Technical Drawing | four-colour badge | 16 | 0.44 s, 1 paths, 103 anchors, 128 MB |
 | Flat Logo | photo-like | 16 | refused after 0.11 s (not flat art), 40 MB |
-| Flat Logo | four-colour badge | 16 | 0.67 s, 5 paths, 67 anchors, 146 MB |
+| Flat Logo | four-colour badge | 16 | 0.66 s, 5 paths, 67 anchors, 146 MB |
 
 ## Revision history
 
 | date | change |
 |:--|:--|
+| 2026-10-13 | Photos: continuous-tone images are smoothed within their tones before quantising, and stacked layers go by lightness |
 | 2026-10-13 | The palette: made of the picture's own colours, noise-made colours merged, blend pixels settled, cuts where colours differ most, colours compared in Oklab |
 | 2026-10-13 | Sub-pixel edges and the outline fitter in Black and White, Grayscale and Color; the harness gains an aliased variant and an "outside px" column, so the baseline was measured again with it (same tracer, main at `baf9693f`) |
 | 2026-10-12 | The harness and the baseline: every preset measured before any change to the tracer |