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https://issues.apache.org/jira/browse/PDFBOX-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13545391#comment-13545391
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Andreas Lehmkühler commented on PDFBOX-1482:
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I added the missing usage of the tint transformation in revision 1429514. I
didn't use the provided patch, as most of the needed code already exists.
> Java color spaces returned by PDDeviceN do not take tint transformation into
> account and type mismatch
> ------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-1482
> URL: https://issues.apache.org/jira/browse/PDFBOX-1482
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.8.0
> Environment: Mac OSX mountain lion, JDK 1.7
> Reporter: Olivier Ceulemans
> Attachments: PDFBOX-1482.patch
>
>
> A patch to fix this issue is provided. Be sure to review it... this is my
> first contribution.
> I tried to solve jira issue PDFBOX-1058 (to contribute a bit) and tried to
> convert the file referenced in this ticket to images using standard utilities
> and I got lots of NullPointerExceptions.
> 1) These NPE occurs because the java color space returned by the PDDeviceN
> doesn't take the tint transformation function into account. When the toRGB
> method method of the color space (ColorSpaceCMYK for the pdf file linked to
> PDFBOX-1058) is called it returns null because the length of the array is not
> of the expected size. This occurs because the tint transformation function is
> not called. The provided patch fix this.
> 2) By debugging this, I also got CastException because I called
> get/setColorantName method that were declared to return list of COSBase. In
> reality they returned list of Strings. To avoid these kind of errors in the
> future, I also introduced generics in the COSArrayList data type. This is
> also provided in the patch.
> The ticket PDFBOX-1058 is still not fully fixed by the patch. Colors still
> looks horrible on some parts. I'm working on it...
> However, by applying the patch there is a clear quality improvement (xerox
> logo on the upper left part of the first page and wave effect in the middle
> of the first page).
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