A blank destination is the document's own profile, so in an RGB document Press Quality (Preserve
Numbers, blank) converted CMYK colours and images to RGB. Output › Destination can now be
DOCUMENT_CMYK, the CMYK profile of the colour settings in effect whatever the document's colour
mode (Illustrator's "Document CMYK"); Press Quality uses it, and the Save PDF dialog lists it after
Document profile. Test: in an RGB document a CMYK image keeps its inks and an RGB image comes out
CMYK.
A document assigned a CMYK profile (Edit > Assign Profile) keeps it when
it is saved, but the working spaces are the app's, and a new session
starts with the defaults. Opened again, such a document exported its CMYK
colours tagged with the working CMYK space (VectorCraft Generic CMYK
(SWOP-like)) instead of its own profile, made that profile the PDF/X
output intent, and separated its RGB colours through it; print
separations did the same. edit.assignProfile still reported the assigned
profile, and document.exportPdf's documentation says CMYK colours are
tagged with "the document's CMYK profile".
Found on a book cover assigned FOGRA39L Coated: built in several
vectorcraft-cli runs, each reopening the saved document, its PDF/X-4
came out tagged with the SWOP-like profile unless every run set FOGRA39
as the working CMYK space again.
Export and print now work in the document's colour spaces: the active
settings with the assigned profiles in their place (document_cms). An
assigned profile that isn't available leaves the working space, with a
warning.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
CMYK went to RGB through display sRGB: CMYK -> sRGB (clamped) -> working RGB.
Into a wider space (Wide Gamut RGB, the 1998 primaries) that clipped every
colour sRGB can't hold - CMYK cyan's red channel landed at 99 instead of 0 -
and the black-point compensation setting had no effect (moxcms leaves it
unimplemented). An ICC CMYK profile now converts directly into the RGB
profile: into its primaries with linear curves, where compensation is a
linear remap from the profile's black (found by sending black through the
profile and reading it back), then onto its own curves. The canvas uses the
same conversion into sRGB, so what shows is what an RGB export writes.
Checked against Ghostscript with the same profiles (relative colorimetric,
compensation on and off): exports into Wide Gamut RGB and the sRGB display
agree within 1 level in 255. The built-in CMYK spaces are unchanged (Generic
CMYK compensates in its own model).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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>
Create PDF layers from top-level layers (document.exportPdf createLayers, the
Save PDF dialog's General option) now writes an optional content group per
top-level layer (template layers are left out): named as the layer, off when
the layer is hidden, /PrintState /OFF when its Print option is off, locked
when it is locked, listed top first, with a print auto-state (not under a
standard). The file reopens with those layers.
The PDF writer has no optional content, so each layer is drawn as a form of
its own (no transparency group, so it draws as in place) starting with a mark;
after writing, the uses of the layers' forms are wrapped in /OC ... BDC/EMC
and the catalog gets /OCProperties (crates/pdf/src/forms.rs, through the
shared patch writer and the PDF syntax reader of encrypt.rs). PDF 1.4 and a
knockout page group write plain page content with a warning; the dialog greys
the option at 1.4. The "not written yet" warning is gone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
document.exportPdf {standard: pdfX1a|pdfX3|pdfX4} and the PDF/X presets now
write conforming files instead of being refused:
- every PDF/X file gets a /GTS_PDFX output intent (by default the CMYK
profile in effect, embedded), TrimBox, Trapped, GTS_PDFXVersion (and
GTS_PDFXConformance for X-1a), a title and dates; editing data,
passwords and, in X-1a/X-3, PDF layers are refused
- PDF/X-1a converts every colour and image to a CMYK destination,
untagged, with CMYK spot alternates; X-3 and X-4 tag colours with ICC
profiles
- X-1a and X-3 are written as PDF 1.3 and their transparency is flattened
first (High Resolution preset; images with see-through pixels count,
rasters stay opaque); X-4 keeps transparency, is PDF 1.6 at most and
names the standard in its XMP metadata
- the written file is checked against its standard (soft masks,
transparency groups, opacity, blend modes, RGB in X-1a, fonts not
embedded) and refused rather than mislabelled
- choosing a standard sets the latest compatibility it allows and turns
off what it forbids (engine and Save PDF dialog)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Save PDF > Output now applies: colours convert to a destination profile
(destination, or preserveNumbers keeping the numbers of colours already in
its model; grey stays grey; images and freeform gradient images convert
too; printer's marks don't). Profile inclusion writes ICC-based colour
spaces (CMYK with the destination's or the document's profile, RGB as sRGB,
grey), and transparency in CMYK output blends in the CMYK profile's space.
The output intent profile is embedded as the catalog's /GTS_PDFX output
intent with its condition, identifier and registry, and Trapped goes in
the document information (PDF/A keeps its own). A shared patch module
edits written PDFs (Lab spot alternates use it too).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Mirko Kerezovic