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pdf: document that the print color settings return a Result

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aiongg committed 2026-10-23 05:21:53 +00:00
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crates/pdf/README.md
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@@ -122,11 +122,13 @@ serialization uses the same backend version as before extraction. It provides:
### Print color
`write::print::cmyk_blending(profile)` returns `SerializeSettings` for a plain CMYK print
PDF: DeviceCMYK color and transparency blending in CMYK (`GroupColorSpace::Cmyk`), with no
output intent. `write::print::settings` adds the document's CMYK profile as a `GTS_PDFX`
output intent and `/Trapped /False`, for PDF/X. The profile is the document's working space. craft-pdf takes the profile bytes and does not depend on
craft-cms. Its CC0 `builtin::COATED_FOGRA39_ICC` is the default working space, described by
`write::print::cmyk_blending(profile)` returns `Result<SerializeSettings, WriteError>`
with the settings for a plain CMYK print PDF: DeviceCMYK color and transparency blending in
CMYK (`GroupColorSpace::Cmyk`), with no output intent. `write::print::settings` adds the
document's CMYK profile as a `GTS_PDFX` output intent and `/Trapped /False`, for PDF/X. Both
fail with `WriteError::InvalidProfile` when the profile is not a readable CMYK ICC profile.
The profile is the document's working space. craft-pdf takes the profile bytes and does not
depend on craft-cms. Its CC0 `builtin::COATED_FOGRA39_ICC` is the default working space, described by
`PrintColor::fogra39`:
```rust