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Images: CMYK and profiled photos show in their colours

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Placed rasters are converted to display sRGB once, at decode time, in one
module (designcraft-images colour):
- embedded ICC profiles in JPEG, PNG, TIFF, WebP and PSD (RGB and grey) are
  applied; sRGB-like profiles leave the pixels exactly as decoded
- CMYK JPEGs (incl. YCCK, Adobe-inverted values), CMYK TIFFs and CMYK PSD
  composites go through their embedded CMYK profile, else the working CMYK
  space, with the colour settings' intent and black-point compensation
- oversized (> 16 MiB), unreadable or mismatched profiles are ignored with a
  log line

The render image cache is rebuilt when the colour settings change. PDF/A
exports of CMYK TIFFs get the same managed RGB as the screen.
This commit is contained in:
aiongg
2026-10-12 21:30:41 +00:00
parent 64f0ca8fa6
commit b20ddf87ec
15 changed files with 883 additions and 33 deletions
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docs/file-format-parity.md
+4 -4
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@@ -54,9 +54,9 @@ score below).
| Format | Ext | InDesign | DesignCraft | Notes | Weight |
|---|---|---|---|---|---|
| PDF / AI (PDF-compatible) | `.pdf`, `.ai` | ✓ page boxes, layers, pages | ✓ rendered with hayro, embedded as vector in PDF export, crop to page boxes | layer visibility depth; editable vectors not offered (#227) | 3% |
| JPEG, PNG, GIF, BMP, WebP | | ✓ | ✓ | CMYK JPEG/TIFF keep inks in PDF (#35) | 2% |
| TIFF | `.tif` | ✓ incl. CMYK, alpha, paths | ✓ incl. CMYK | clipping paths from 8BIM resources unverified | 1% |
| PSD | `.psd` | ✓ layers, comps, alpha, paths | ~ composite + Object Layer Options | layer comps partial | 1% |
| JPEG, PNG, GIF, BMP, WebP | | ✓ | ✓ embedded ICC profiles applied on screen; CMYK JPEGs (incl. YCCK) through their own profile or the working CMYK space | CMYK JPEG/TIFF keep inks in PDF (#35) | 2% |
| TIFF | `.tif` | ✓ incl. CMYK, alpha, paths | ✓ incl. CMYK, embedded ICC profiles on screen | clipping paths from 8BIM resources unverified | 1% |
| PSD | `.psd` | ✓ layers, comps, alpha, paths | ~ composite + Object Layer Options; embedded ICC profile and managed CMYK on screen | layer comps partial | 1% |
| EPS | `.eps` | ✓ (PostScript) | ~ preview only (no interpreter) | | <1% |
| SVG | `.svg` | ✓ | ✓ (usvg) | | <1% |
| HEIC | `.heic` | ✓ | ✗ | | <1% |
@@ -74,7 +74,7 @@ score below).
|---|---|---|---|
| Adobe Swatch Exchange | `.ase` | read/write | ✓ load and save |
| Colour books | `.acb` | read (17 libraries ship) | ✗ (licensed libraries; Pantone etc. out of scope, own libraries possible) |
| ICC profiles | `.icc`, `.icm` | read | ✓ |
| ICC profiles | `.icc`, `.icm` | read | ✓ (also profiles embedded in placed images) |
| Colour settings | `.csf` | read/write | ✗ |
| PDF presets | `.joboptions`, `.pdfs` | read/write | ✗ |
| Print / flattener / document presets | `.prst`, `.flst`, `.dcst` | read/write | ✗ |
docs/target-app-parity.md
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@@ -371,7 +371,7 @@ It is evidence of breadth: each item exists. It is not a claim of InDesign-level
- PDF/X-4 export (`file.exportPdf {standard: "x4"}`): an output intent with our own Generic CMYK ICC profile (lut16 tables generated from the parametric press model), GTS_PDFXVersion in Info and XMP, `pdf:Trapped` in XMP as in Info, RGB images without a profile tagged sRGB, no image interpolation (none in PDF/A either), and built-in PDF/X-4 checks reported as warnings. qpdf finds no errors in the result.
- EPS place: placed at its (high-resolution) bounding box and shown, printed and exported through its TIFF preview, or a placeholder when it has none. PostScript itself isn't interpreted.
- Preferences: Dictionary (user dictionary; `spelling.setWords/words`), Spelling (Dynamic Spelling: red squiggles on the canvas, also Edit ▸ Spelling), Autocorrect (word list, applied as you type), Notes, Track Changes, Story Editor Display and File Handling (recovery interval) sections.
- Colour management exposed: Edit ▸ Color Settings (`color.settings`: RGB/CMYK working spaces, intent, black-point compensation; `color.loadProfile` for ICC files; `color.convert` through the working spaces, with gamut checks) and View ▸ Proof Setup / Proof Colors (press, sRGB, legacy Mac RGB, colour-blindness simulations, simulate paper) on the canvas.
- Colour management exposed: Edit ▸ Color Settings (`color.settings`: RGB/CMYK working spaces, intent, black-point compensation; `color.loadProfile` for ICC files; `color.convert` through the working spaces, with gamut checks) and View ▸ Proof Setup / Proof Colors (press, sRGB, legacy Mac RGB, colour-blindness simulations, simulate paper) on the canvas. Placed images are shown through their embedded ICC profiles, and CMYK images through their own profile or the working CMYK space, with the settings' intent and black-point compensation.
- Keyboard: Tab / Shift+Tab hide and show all panels / all but Tools (`window.hidePanels`, `window.hidePanelsExceptTools`); Cmd+F6 / Cmd+Shift+F6 cycle documents; panel fields are reached with Tab and Escape returns to the layout.
- Smart guides and snapping (View ▸ Snap to Guides / Snap to Document Grid / Smart Guides, `view.snapPreferences` and Preferences ▸ Guides & Pasteboard): moving, drawing, resizing, rotating and pen/anchor drags snap in order to the document and baseline grids, ruler guides, margins and columns, other objects' edges and centres (parent-page items too, by visible stroked bounds), equal spacing, matching dimensions and matching rotation, with guides, gap marks and measurements drawn on the canvas. Shift and Cmd constrain the gesture.
- View ▸ Rotate Spread (`view.rotateSpread`, `layout.rotateSpreadView`): the spread in view turns in quarter turns on screen (stored with the document; output is unaffected). The canvas maps each spread through its own transform, so tools, snapping, resize handles, guides, overlays and rendering all follow the turned spread.