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MrCloudy2andClaude Opus 5.5 7e5d2ce6da Warp presets: Photoshop's Bezier control grids instead of approximations (#3444)
The 15 warp presets (Edit > Transform > Warp, smart object warps, Warp
Text) were our own closed-form approximations, up to 70 px off
Photoshop's: Arc kept its centre fixed and pulled the ends in where
Photoshop keeps the inner edge's corners and raises the middle, Flag
waved the wrong way at a third of the height, Squeeze shrank instead of
pinching.

Measured on Photoshop 27.11 (scripted renders of a grid image whose
colours encode each pixel's position, 102 cases: every preset at bend
±50 and ±100, both distortions, vertical orientation, square, wide and
tall boxes), every preset is a single bicubic Bezier patch (fits within
0.5 px). Its control grid:
- Arc: each row a circular arc of b·π around one centre, the inner edge
  keeping its chord; Arch, Bulge, Arc Lower/Upper and Shell built from
  the same arcs. Circular in pixels on any box.
- Flag, Wave, Fish, Rise, Fisheye, Inflate, Squeeze, Twist: control
  points moved linearly with the bend, in box units.
- Vertical distortion scales the top and bottom rows about their
  midpoints and blends the rows between; horizontal distortion scales
  each column. Vertical orientation swaps the axes and the two
  distortions.
All 102 cases land within 1 px (median) of Photoshop. On the corpus's
Photoshop-made warped text, warp-arc-50 now spans 340x85 at (-3, 3)
against Photoshop's 350x88 at (-7, 3), where it was 278x74 at (28, 62).

Presets also convert to custom meshes exactly now (to_mesh splits the
patch instead of fitting). Tests that pinned the old shapes now assert
Photoshop's; presets_match_photoshop checks measured points.

Still open: Warp Text warps over our line box, while Photoshop uses the
type layer's stored `bounds`; with those the five corpus warp files land
within a few px (arc, flag, bulge with distortion, twist, vertical rise).

Co-authored-by: Claude Opus 5.5 <[email protected]>
2026-10-11 23:56:17 -04:00
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2026-09-30 05:02:08 -04:00