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https://issues.apache.org/jira/browse/PDFBOX-4607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892936#comment-16892936
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Tilman Hausherr commented on PDFBOX-4607:
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Thank you! I noticed that in the upper part of the patch, you're not asking for
TYPE_GRAY. Is this because you are sure that such a colorspace would always be
an ICC_ColorSpace?
> Transparent 16 bit image doesn't display in Adobe Reader
> --------------------------------------------------------
>
> Key: PDFBOX-4607
> URL: https://issues.apache.org/jira/browse/PDFBOX-4607
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.12, 2.0.16
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: regression
> Attachments: 16bit-transparent.pdf, 16bit-transparent.png,
> Correctly_handle_grayscale_colorspacees_when_setting_the_alternate__colorspace_.patch
>
>
> Thomas on stackoverflow has very simple code that creates a PDF from a 16 bit
> PNG image. The PDF displays fine on Adobe Reader in 2.0.8 but no longer since
> 2.0.12. It displays on all other viewers I've tried: PDFBox, GS, PDF.js and
> Chrome. It works on Adobe Reader when disabling the predictor logic in
> LosslessFactory.java. Thomas and I narrowed the problem last evening and now
> he has a non confidential file for us and also a workaround on his side.
> To reproduce the problem I used the ImageToPDF example.
> cc [~rototor]
> the "bad" file has imageType custom, colorspace with getNumComponents = 1, 8
> bpc, data buffer TYPE_BYTE
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