andeecollardandClaude Opus 5.5 cbe793e059 Image Trace: grayscale gradients use grey stops ...

In Grayscale mode with Gradients on, the trace could fill paths with
coloured linear gradients (for example a blue-to-orange ramp) beside
grey flat fills. Gradient detection ran on the RGB image, so the stops
and the gradient's palette colour (its middle) were the source colours,
while Grayscale's flat fills come from each pixel's luma.

Grayscale now finds gradients, and settles their edges, in a copy of the
image reduced to the same Rec. 601 luma the flat grays are quantised
from. Every channel of that copy is equal, so the fitted stops, the ends
carried to the area's edges and the palette entry are all grey. Color
mode is unchanged: it still detects on the RGB image (trace output for
gradient fixtures is byte-identical before and after).

Adds grayscale_gradients_are_grey: a code-drawn sky ramp over flat
shapes with a ramp rectangle, traced in Grayscale with 4 grays and
Gradients on, must still produce a gradient, and every path colour,
gradient stop and palette entry must be grey.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018tBcdwNhptqtmX32JCGFzB

2026-10-15 18:14:17 +00:00

..

src

Image Trace: grayscale gradients use grey stops

2026-10-15 18:14:17 +00:00

tests/quality

Image Trace: enhanced versions of the presets

2026-10-14 06:43:57 +07:00

Cargo.toml

Image Trace: stroked centre lines lie in the middle of their ink and are as wide as it

2026-10-13 09:36:47 +07:00