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Fix #320: CMYK images stay CMYK from PDF import to PDF export

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A PDF's DeviceCMYK image opened as RGB (the interpreter's pixels as a PNG),
so every export wrote it as DeviceRGB or ICC RGB, silently. Images now keep
their CMYK samples, as CMYK colours already did:

- Model: CMYK images are blobs holding CMYK samples, a four-component JPEG
  (Adobe's inverted samples) or a Deflate CMYK TIFF. vectorcraft-doc's cmyk
  module reads their ink amounts (ImageBlob::is_cmyk, ::cmyk, capped at 64
  megapixels) and writes the TIFF (ImageBlob::cmyk_tiff).
- PDF import: DeviceCMYK, CalCMYK and four-component ICC images keep their
  samples. A JPEG with Decode [1 0 1 0 1 0 1 0] is kept byte for byte; any
  other is decoded (8 or 16 bits, its Decode array applied) and stored as a
  CMYK TIFF. Masked CMYK images and 1/2/4-bit ones open in RGB with a warning.
  Placing a CMYK TIFF keeps it CMYK too.
- PDF export: CMYK images are written in CMYK (DeviceCMYK, or ICC-based with
  the CMYK profile when colours are tagged: PDF/X-3, PDF/X-4, PDF/A). A CMYK
  JPEG neither resampled nor recompressed passes through unchanged; others are
  resampled in CMYK and compressed as ZIP or as a CMYK JPEG (jpeg-encoder,
  which also replaces the ZIP fallback and its warning for images converted to
  CMYK). Output conversion treats them like CMYK colours: Preserve Numbers and
  PDF/X-1a keep their numbers, Convert to Destination converts them to another
  CMYK profile or to RGB through a 17^4 lookup table (cms::CmykLut, now also
  behind the renderer's ink table). A CMYK image that can't be decoded is
  reported in the warnings.
- Canvas: CMYK images show through the working CMYK profile, as CMYK fills
  do, and paint their own inks in ink planes (CMYK raster exports, CMYK
  blending). SVG export writes TIFF images as PNG.

Illustrator's Output › No Conversion keeps colour data as it is
(https://helpx.adobe.com/illustrator/using/pdf-options.html).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-08 06:04:07 +07:00
co-authored by Claude Opus 5.5
parent a18e671817
commit ab62b5f8e8
23 changed files with 1035 additions and 145 deletions
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@@ -333,6 +333,10 @@ Images follow the `compression` settings of their kind (`color`, `gray`, or `mon
`abovePpi` as placed they are resampled (`downsample`: `average`, `subsample` or `bicubic`) to `ppi`, and compressed
with `zip`, `jpeg` (at `quality`; images with transparency stay lossless) or `auto` (JPEGs stay JPEG, the others
lossless). `none`, `jpeg2000`, CCITT and `runLength` are written as ZIP, with a warning when an image needs them.
CMYK images stay CMYK (DeviceCMYK, or ICC-based with the CMYK profile when colours are tagged, as in PDF/X-3 and
PDF/X-4): a CMYK JPEG neither resampled nor recompressed is written unchanged, and the others' ink amounts are
resampled and compressed again (CMYK JPEG or ZIP). `output.conversion` converts them like CMYK colours: `destination`
to another CMYK profile or to RGB, `preserveNumbers` (and PDF/X-1a) keeps their numbers in a CMYK destination.
`document.pdfSettings` lists the options that differ from the preset and the warnings without writing a file.
`thumbnails: true` embeds each page drawn small (106 px on its long side, without the layers the page leaves out) as
its `/Thumb` image. `fastWebView: true` writes a linearised file (the linearization dictionary first, then the first
@@ -348,7 +352,10 @@ Opening a PDF (or `.ai`) imports every page as an artboard and layer; `document.
and `password` for an encrypted file. `document.pdfInfo` reads a file without opening it: the page count, each page's
size and boxes, `needsPassword`, and with `thumbnail: n` a PNG of page n. Imported colours keep their model:
DeviceCMYK and CMYK ICC colours stay CMYK (a file painted mostly in CMYK opens as a CMYK document), DeviceGray is Gray,
and Separation and DeviceN inks become spot swatches the art links to at its tint (gradient stops too).
and Separation and DeviceN inks become spot swatches the art links to at its tint (gradient stops too). CMYK images
(DeviceCMYK, or ICC-based with four components) keep their ink amounts: a CMYK JPEG as it is, any other as a CMYK TIFF
(masked CMYK images, and ones with 1, 2 or 4 bits per sample, open in RGB with a warning). Placing a CMYK TIFF keeps it
CMYK too.
`colorMode: "rgb" | "cmyk"` opens any file in that mode instead, its colours converted as `file.documentColorMode` does:
```json