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https://issues.apache.org/jira/browse/PDFBOX-2070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997810#comment-13997810
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Juraj Lonc commented on PDFBOX-2070:
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I did not mean it as a replacement for this fix.
I meant it as an addition. For case that someone loads PDF that already has
such wrong elements and saving would "heal" it.
But I understand that it is a complete different story for another issue.
That was just an idea.
> Filter.decode() modifies PDF if there is a filter array
> -------------------------------------------------------
>
> Key: PDFBOX-2070
> URL: https://issues.apache.org/jira/browse/PDFBOX-2070
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Fix For: 2.0.0
>
> Attachments: after.pdf, before.pdf
>
>
> If there are several filters (filter array) in an image, PDFBox is inserting
> an empty DecodeParms object here
> {code}
> params.setItem(COSName.DECODE_PARMS, getDecodeParams(params, index));
> {code}
> instead of either inserting an empty COSArray, or (better) do nothing. Saving
> such a PDF results in it not being displayable in the Acrobat Reader.
> Test code:
> {code}
> PDDocument d = PDDocument.load("before.pdf");
> new PDFRenderer(d).renderImage(0);
> d.save("after.pdf");
> {code}
> The rendering is important because without it, the filtered objects aren't
> decoded.
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