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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2018/07/17 17:05:00 UTC

[jira] [Created] (PDFBOX-4267) Incorrect rendering when /Matte entry

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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