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https://issues.apache.org/jira/browse/PDFBOX-5101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283924#comment-17283924
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Michael Klink commented on PDFBOX-5101:
---------------------------------------
The technique conceptually is the same as used for highlighting text (there the
equivalent is done in the annotation content stream), and there usually also
Multiply is used.
Yes, this does change certain colors, but in generic situations this is the
best you can get.
> White boxes after adding color in background
> --------------------------------------------
>
> Key: PDFBOX-5101
> URL: https://issues.apache.org/jira/browse/PDFBOX-5101
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.21
> Reporter: Wilhelm Ziegler
> Priority: Major
> Labels: how-to
> Attachments: with BG color.PDF, without BG color-darkened.PDF,
> without BG color.PDF
>
>
> Hey,
> I'm facing a problem when adding a background color to some documents with
> pdfbox. I am using the following code to add color do a document:
>
> {code:java}
> try (PDPageContentStream cs = new PDPageContentStream(doc, page,
> PDPageContentStream.AppendMode.PREPEND, true, true)) {
> cs.saveGraphicsState();
> cs.setGraphicsStateParameters(gs);
> cs.setNonStrokingColor(hexToColor(hexColor));
> cs.addRect(0, 0, page.getMediaBox().getWidth(),
> page.getMediaBox().getHeight()); cs.fill();
> cs.restoreGraphicsState();
> }
> {code}
> I've tried adding color in 3 different ways and always get the same problem
> (see attached documents). I don't know how to fix this and would really
> appreciate it if someone could help me out or steer me in the right
> direction. Thank you in advance
>
>
> Best regards,
> Wilhelm
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