dotCooCoo 3b327d9512 EPS import: CMYK images keep their ink amounts ...

The PostScript interpreter that reads EPS and PostScript files turned
the samples of a CMYK image into display RGB and stored an RGBA PNG,
so the image lost its ink amounts. The DCTDecode filter decoded a CMYK
JPEG to RGB, so it lost its ink amounts too. The PDF importer keeps
the ink amounts of 8- and 16-bit CMYK images (in a CMYK TIFF, or the
CMYK JPEG itself).

A CMYK image (image or colorimage in DeviceCMYK, CIEBasedDEFG or a
four-component ICCBased space) now keeps its samples in a CMYK TIFF
(ImageBlob::cmyk_tiff), read through its Decode array, at every bit
depth the interpreter reads. A CMYK JPEG gives its samples as stored,
and the image's Decode array reads them: [1 0 1 0 1 0 1 0] undoes the
inverted samples of Adobe's CMYK JPEGs. The pixels that a MaskColor
or an ImageType 3 mask hides become a grayscale opacity mask over the
image, as in PDF import. A mask that hides nothing adds no mask. Gray,
RGB, indexed and spot color images and image masks stay RGBA PNGs.

Docs: docs/file-format-parity.md, docs/target-app-parity.md.

2026-10-16 06:16:35 +07:00

..

src

EPS import: CMYK images keep their ink amounts

2026-10-16 06:16:35 +07:00

Cargo.toml

.ai import: art styles, a clipping path's own fill, compound paths of looks and a group's own transparency from the editing data

2026-10-12 23:07:05 +07:00