Tilman Hausherr created PDFBOX-4267:
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Summary: Incorrect rendering when /Matte entry
Key: PDFBOX-4267
URL: https://issues.apache.org/jira/browse/PDFBOX-4267
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.11, 3.0.0 PDFBox
Reporter: Tilman Hausherr
The image softmask in the attached file has a {{/Matte 0 0 0}} entry. PDFBox
displays the PDF differently than Adobe Reader, the reflection shown by PDFBox
is barely visible. When the /Matte entry is deleted, then it is barely visible
in Adobe Reader too. So the /Matte entry does make some difference, although I
don't understand how.
In the PDF specification, the formula shown is c' = m + α x (c - m). So 0
should have no effect?!
I looked at the code of PDF.js, they have a special handling when alpha is 0.
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