Martin Mancuska created PDFBOX-4146:
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Summary: 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
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 we can take a look on it and integrate
it into your code base, or propose better solution.
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