mirror of
https://github.com/storytold/vectorcraft.git
synced 2026-10-25 10:17:02 -06:00
dotCooCoo
3adf5141e7
In a CMYK document, an RGB color from the Eyedropper, a hex value or
paint.setFill was stored as CMYK by the profile-free formula
(k = 1 - max(r, g, b)), not through the color settings. RGB 83/170/223
came in as C63 M24 Y0 K13. A CMYK image was sampled through the RGB its
decoder shows, so its inks came back only when the formula happened to
round-trip them.
paint_from now converts an RGB color into a CMYK document with
Cms::convert and the settings' intent, as Document Color Mode and Swatch
Options already do. This covers paint.setFill and paint.setStroke,
gradient stops, swatch.new {color} and the Eyedropper. With Generic CMYK,
83/170/223 now separates to C59 M12 Y3 K0, and #ff0000 now separates to
C0 M97 Y100 K0 instead of C0 M100 Y100 K0. keepModel: true still keeps
RGB. paint.sampleColor with a stop stores the color the same way.
The Eyedropper samples a CMYK image's ink amounts (a four-component
JPEG, or an 8- or 16-bit chunky CMYK TIFF) and returns them unchanged
(ImageBlob::sample_cmyk_object), also in an RGB document. It takes an
RGB image's sRGB pixel into the working RGB space, as the screen color
sampler does, so the picked color shows as the pixel when the working
space is not sRGB.
Docs: docs/mcp.md, docs/target-app-parity.md.