Transparent PNGs in docx to PDF conversion

[esglobal]

I tried everything I could but I can't find a way to convert a docx file that has a transparent PNG and keep the transparency.

So the docx has a yellow background and I have a transparent PNG top right. The docx file looks good but the converted PDF has white background around the PNG.

Has anyone had this issue? Couldn't find anything in the docs.

[gulien]

Hello @esglobal!

It might be a limitation of LibreOffice 🤔 I found no options or else for forcing the transparency.

[esglobal]

The thing is when I do on a separate machine, a standard manual conversion with libreoffice works like a charm.

[gulien]

Interesting, what's the LibreOffice version?

[esglobal]

LibreOffice 6.4.7.2 and unoconv 0.7 on both machines

[gulien]

You mean that Gotenberg also uses LibreOffice 6.4?

[esglobal]

Nah sorry the docker host has LibreOffice 6.4 my bad

[gulien]

Gotenberg relies on LibreOffice 7.x, so it could be the culprit 🤔

[esglobal]

I'll try update LibreOffice to 7.x and run the same conversion. I don't believe the could've dropped support for transparency, but maybe there are some new parameters.

[gulien]

Yep or a bug, it happens 🤷‍♂️

[esglobal]

Hi @gulien so I used the standard libreoffice --headless --convert-to pdf:writer_pdf_Export test.docx to convert on both versions and LibreOffice 6 preserves PNG transparency, while LibreOffice 7 doesn't.

I'll keep digging and if I will find something useful I'll post it here. Thanks for looking into it

[esglobal]

I can confirm 100% that Gotenberg v6 works like a charm, while v7 has issues with PNG transparency in docx documents.

I'll stick to v6 until v7 bug will be fixed. If it'll be fixed