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Gradients: Dither in the Gradient panel draws a gradient fill with fine noise that hides banding

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Illustrator 30.0's gradient Dither, from the public documentation
(https://helpx.adobe.com/illustrator/desktop/paint-and-fill/create-and-edit-gradients/control-dither-in-gradients.html):
a Dither checkbox in the Gradient panel; dither converts the gradient into
pixels with subtle noise, works with gradient fills only, and follows the
Document Raster Effects resolution.

- Gradient gains `dither` (serde default false, written only when on, so
  older files open unchanged and new files keep it).
- The renderer draws a dithered linear or radial fill as an image paint: the
  gradient sampled a cell per device pixel or finer (quarter-octave steps,
  cached per thread), each channel given seeded triangular noise of up to a
  level before rounding. Same pixels every run; strokes and undithered fills
  draw exactly as before. PNG and other raster exports go through it.
- SVG and PDF write a dithered fill as an image at the document's raster
  effects resolution, clipped to the shape (the freeform-gradient path);
  characters' fills stay vector gradients in SVG, with a warning.
- paint.editGradient and paint.setFill take `dither`; strokes refuse it.
  The Gradient panel's Dither box is dimmed behind the Stroke proxy.
- i18n rows in all 24 catalogs; docs: G13, target-app-parity, ui-parity,
  mcp.md, plugins.md.
This commit is contained in:
Taha-Mahmoodi
2026-10-22 22:38:42 +07:00
committed by bflatastic
parent a1d8952bc8
commit cc1a660a6d
47 changed files with 579 additions and 41 deletions
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docs/plugins.md
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@@ -198,7 +198,7 @@ type and `blob` but without their data, which follows the JSON in a saved file;
`paint`, `width` in points, `join` (`"miter"`, `"round"` or `"bevel"`), `cap` (`"butt"`, `"round"` or `"square"`)
and `miterLimit`. Paints use the
native file format's form: `{"type": "solid", "color", "swatch"?, "tint"?}`, `{"type": "gradient", "gradient":
{"kind": "Linear"|"Radial"|"Freeform", "stops": [{offset, color, opacity, midpoint}]}, "geom"?, "angle",
{"kind": "Linear"|"Radial"|"Freeform", "stops": [{offset, color, opacity, midpoint}], "dither"?}, "geom"?, "angle",
"freeform"?}`, `{"type": "pattern", "pattern", "xf"?}`. Colours are `{"model": "rgb", r, g, b}`, `{"model": "cmyk",
c, m, y, k}`, `{"model": "gray", k}` (ink: 0 white, 1 black) or `{"model": "lab", l, a, b}`; components 0–1 except
Lab's.