| Summary: | [PATCH] Correctly decode Adobe CMYK JPEGs in PDF export | ||
|---|---|---|---|
| Product: | cairo | Reporter: | Peter TB Brett <peter> |
| Component: | pdf backend | Assignee: | Adrian Johnson <ajohnson> |
| Status: | RESOLVED FIXED | QA Contact: | cairo-bugs mailing list <cairo-bugs> |
| Severity: | enhancement | ||
| Priority: | medium | CC: | adyer |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | Patch fixing the bug | ||
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Created attachment 126243 [details] Patch fixing the bug We've been carrying this patch downstream for quite a while, and we have decided to try and get it integrated upstream since it seems pretty generally useful. It applies cleanly against git "master". Adobe PhotoShop generates CMYK JPEG files with inverted CMYK. When a JPEG file with this format is included in a PDF file, a `/Decode` array must be included to convert to "normal" CMYK. These JPEG files can be detected via the presence of the APP14 "Adobe" marker. However, PDF viewers are not required to detect and handle this private marker, so it must be detected and handled (by adding a `/Decode`) by the PDF generator.