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https://issues.apache.org/jira/browse/PDFBOX-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394503#comment-16394503
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Tilman Hausherr commented on PDFBOX-4146:
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This looks good and I tested it with two different images and the resulting PDF
is shown identically in Adobe Reader and PDFBox than the "created before the
change" PDF. IMHO it is a bug in Mac Preview. There are some transformations to
be done when showing annotations and it isn't easy. However I'd like to sleep
one more night before deciding whether to commit.
> Patch: Fix for appearance of visible signature
> ----------------------------------------------
>
> Key: PDFBOX-4146
> URL: https://issues.apache.org/jira/browse/PDFBOX-4146
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.8
> Reporter: Martin Mancuska
> Priority: Minor
> Labels: Signature, patch
> Fix For: 2.0.9
>
> Attachments: visible_signature.patch
>
>
> We're using PDFBox (as backend used by Esig DSS) for digital signing of
> documents. We've found out that visible signature has different look on Mac
> Preview app than other PDF viewers. After some investigation we suspect that
> BBox-es for appearance of signature is not filled correctly by PDFBox. The
> values are hard coded as [0, 0, 100, 50]. Also transformation matrix for
> translating from form XObject coordinate system into default one has value
> (1, 0, 0, 1, 0, 0) -> no scaling between default user coordinate system and
> form XObject coordinate system.
> Therefore I think that the Mac Preview App draws signature with dimensions
> 100x50 because no transformation were done.
> I've attached patch which solves this issue for us. The signature is shown
> correctly in all PDF viewers now. Maybe you can take a look on it and
> integrate it into your code base, or propose better solution.
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