Switching to CMYK separates RGB greys through the CMYK profile into
four-colour greys and a rich black, as Illustrator does; only Gray
colours stay on the black plate. The command catalogue said "greys stay
greys", which read as if R = G = B colours went to K only.
- file.documentColorMode (and its alias) and document.open {colorMode}
take grays: "profile" (default, unchanged) | "black". With "black",
RGB greys with R = G = B convert to K only, K = their grey value (the
inks Edit Colors > Convert to Grayscale before the switch gives);
other colours convert as before. Swatches, tints, gradient stops and
pattern tiles follow the same rule.
- Pattern tiles are now converted with the rest of the document (they
kept RGB colours in a CMYK document before), as the command said.
- The command catalogue, docs/mcp.md and the ROADMAP say what happens to
Gray colours and RGB greys.
- Tests: the profile path (four-colour greys, rich black, pattern tiles,
Gray kept), grays: "black" over art, swatches, tints, gradients and
patterns, document.open, and the issue's file over MCP through a PDF
export and back.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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