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https://issues.apache.org/jira/browse/PDFBOX-323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neil McErlean updated PDFBOX-323:
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Attachment: pdfbox323.patch
OK, here's another patch that fixes this issue in all images in both sample
pdfs attached to the issue: test.pdf and About Stacks.pdf.
Note that this patch overwrites the changes in the previous one and therefore
should be used instead of it.
The image in test.pdf and one of the 5 images in About Stacks.pdf were indeed
PDPixelMaps. Thanks Andeas. But there was a bit more work than just reusing the
previous patch. :( Turns out SMask images can be transparency masks OR opacity
masks.
Here's what this patch does:
* PDXObjectImage now has methods to get the SMaskImage and the Decode array for
image XObjects.
Note that the decode array is only used in this patch for smask images
although it can have meaning in "base images".
* PDPixelMap & PDJpeg now get the SMask image (if there is one) and its decode
array and asks CompositeImage to create an image that combines the base image
with the transparency mask.
* CompositeImage a new class which does the work of combining base images with
transparency/opacity masks.
> Images with transparency are not rendered correctly
> ---------------------------------------------------
>
> Key: PDFBOX-323
> URL: https://issues.apache.org/jira/browse/PDFBOX-323
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Priority: Minor
> Attachments: About Stacks.pdf, pdfbox323.patch, test.pdf
>
>
> [imported from SourceForge]
> http://sourceforge.net/tracker/index.php?group_id=78314&atid=552832&aid=1833244
> Originally submitted by phenderson on 2007-11-16 08:23.
> PDF documents that contain images with transparent regions are not rendered
> correctly. The transparent areas are painted black.
> Attached is an example pdf with text behind an image, generated via
> OpenOffice.
> Cheers
> Peter Henderson
> [attachment on SourceForge]
> http://sourceforge.net/tracker/download.php?group_id=78314&atid=552832&aid=1833244&file_id=254618
> test.pdf (application/pdf), 196955 bytes
> example pdf
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