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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2018/08/18 11:58:00 UTC
[jira] [Assigned] (PDFBOX-4267) Incorrect rendering when /Matte
entry
[ https://issues.apache.org/jira/browse/PDFBOX-4267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr reassigned PDFBOX-4267:
---------------------------------------
Assignee: Tilman Hausherr
> 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
> Assignee: Tilman Hausherr
> Priority: Major
> Attachments: bugzilla888437.pdf, gs-bugzilla688797-reduced.pdf, gs-bugzilla688797.pdf
>
>
> 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, don't know why.
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