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https://issues.apache.org/jira/browse/PDFBOX-994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193654#comment-14193654
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John Hewson commented on PDFBOX-994:
------------------------------------
{quote}
Commit 1636079 from John Hewson in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1636079 ]
PDFBOX-2423: Fix/improve rendering of transparency groups
{quote}
This commit has improved the situation, but it's still not perfect. The cause
seems to be SoftMaskPaint.
> Rendering issues with colors and transparency
> ---------------------------------------------
>
> Key: PDFBOX-994
> URL: https://issues.apache.org/jira/browse/PDFBOX-994
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 1.1.0, 1.5.0, 1.6.0
> Environment: Debian Squeeze
> Reporter: Andreas Romeyke
> Fix For: 2.0.0
>
> Attachments: PDFBOX994-Test_PDFBox1.png, Test_PDFBox.pdf,
> Test_PDFBox.png, r1636079.jpg
>
>
> Hello,
> I am calling convertToImage() with a multicolored, standard PDF-file and the
> resulting image does not contain the content of some colored stuff.
> An example of such a PDF-file (v1.4) could be sent...
> The same problem occurs in 1.5/1.4 and previous..., I 've also used the
> bleeding edge from repository (2011-04-04), the problem still exists.
> Additionally, the following trace will be printed:
> 04.04.2011 15:35:07 org.apache.pdfbox.util.PDFStreamEngine processOperator
> WARNUNG: java.lang.ClassCastException: org.apache.pdfbox.cos.COSFloat cannot
> be cast to org.apache.pdfbox.cos.COSInteger
> java.lang.ClassCastException: org.apache.pdfbox.cos.COSFloat cannot be cast
> to org.apache.pdfbox.cos.COSInteger
> at
> org.apache.pdfbox.pdmodel.common.function.PDFunctionType2.eval(PDFunctionType2.java:81)
> at
> org.apache.pdfbox.pdmodel.graphics.color.PDSeparation.calculateColorValues(PDSeparation.java:238)
> at
> org.apache.pdfbox.util.operator.SetNonStrokingSeparation.process(SetNonStrokingSeparation.java:68)
> at
> org.apache.pdfbox.util.operator.SetNonStrokingColor.process(SetNonStrokingColor.java:93)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:551)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:274)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:251)
> at
> org.apache.pdfbox.util.operator.pagedrawer.Invoke.process(Invoke.java:130)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:551)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:274)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:251)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:225)
> at org.apache.pdfbox.pdfviewer.PageDrawer.drawPage(PageDrawer.java:107)
> at org.apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.java:722)
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