Jon Wu created PDFBOX-2681:
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Summary: Colors inaccurate rastered CMYK source w/ gradient + photo
Key: PDFBOX-2681
URL: https://issues.apache.org/jira/browse/PDFBOX-2681
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.0
Environment: Tested on OS X 10.10, Java 1.6 / 1.8
Reporter: Jon Wu
In the attached gradient-test-photo.pdf, there's a photo with a gradient on top
of it. The colors in the gradient are CMYK. When rasterizing this test file
with PDFBox 2.0.0 SNAPSHOT 20150209, the resulting image's gradient is
different from the original and the colors of the photo under the gradient look
significantly different vs the display in Adobe tools like Illustrator or other
compliant PDF readers.
Issues:
- Color hue is wrong. Is this a CMYK to RGB issue?
- Opacity of gradient is wrong and much different. The jpg from Illustrator
shows much more of the photo without a gradient over it.
Without a photo, there's still a difference, but it's much harder to see.
Example in gradient-test.pdf where the same gradient is drawn over a grey
rectangle.
If I convert the PDF to RGB in Illustrator first and rasterize the RGB PDF with
PDFBox, the result is nearly identical between Illustrator and PDFBox so this
seems like a CMYK conversion issue in both the general color conversion and
maybe how the gradient is calculated.
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