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

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-4267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-4267.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0 PDFBox
                   2.0.12

Thank you [~janipe] for the help!

> 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
>             Fix For: 2.0.12, 3.0.0 PDFBox
>
>         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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