[Bug]: PDF-A converts highlights without opacity

[b-v-d-e-v]

Installation Method

Docker fat

The Problem

We are trying to convert PDF documents with highlighted words/sentences to PDF-A. During this process the highlighting looses the opacity and the text is not readable anymore.

Original:

PDF-A Result:

Additionally the index seems to be wrong: the last charakter is not covered.

Converting to image (PNG) is working as expected.

Version of Stirling-PDF

0.41.0

Last Working Version of Stirling-PDF

No response

Page Where the Problem Occurred

No response

Docker Configuration

Relevant Log Output

Additional Information

For convenience testing: the test document created with acrobat reader: TestDocHighlighted.pdf

Browsers Affected

Firefox, Other

No Duplicate of the Issue

• [x] I have verified that there are no existing issues raised related to my problem.

[tomasbernardino]

Hi, I’m interested in contributing to this issue and have been able to reproduce the problem. Before diving into a fix, I’d like to know whether this is an internal bug within Stirling PDF or if it's caused by a third-party library used for PDF/A conversion.

[Frooodle]

We currently use libreoffice for pdf/a conversion

[b-v-d-e-v]

@tomasbernardino you are right! (if my manual test using the GUI is valid)

LibreOffice is opening the document like:

And that's how the pdf-a looks alike. When I do the highlighting within libreoffice everything is fine after the export too.

[b-v-d-e-v]

obviously a very old LibreOffice bug - very sad... LibreOffice BugZilla

[b-v-d-e-v]

Great work @tomasbernardino! Thanks a lot!