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Taha-Mahmoodi
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Illustrator 30.0's gradient Method, from the public documentation (https://helpx.adobe.com/illustrator/desktop/paint-and-fill/create-and-edit-gradients/control-perceptual-interpolation-in-gradients.html): Classic or Perceptual; perceptual interpolation matches colour transitions to how the eye perceives differences between colours, and perceptual gradients are rasterised when saved as PDF or SVG. - Gradient gains `method` (Classic | Perceptual; serde default Classic, written only when Perceptual, so older files open as Classic and Classic files are written as before). The colour crate's OKLab helpers open up for it. - Perceptual mixes neighbouring stop colours in OKLab (sample, and sample_keep_model for the stroke meshes, Expand and blends); opacity stays linear. Renderers that mix linearly get stops on the perceptual curve, placed by halving each half segment where a straight line strays more than 0.4 of a colour level (a nearly straight segment needs none). Classic gradients expand exactly as before. - draws_as_pixels includes Perceptual gradients, so SVG and PDF write a Perceptual fill or stroke as an image at the document's raster effects resolution, clipped to what it paints. A gradient along or across a stroke stays slices (PDF no longer draws it as a within-stroke image). - With Dither: a dithered Perceptual fill is the perceptual mix with dither's noise (the canvas's dithered grids are keyed by method too); SVG and PDF write it as an image with the noise, and a dithered Perceptual stroke as an image without it, as the canvas draws it (GradientPaint::pixels, SVG's raster_paint and PDF's area are told whether they paint a fill).