(In reply to Valentin Melot from comment #26)
> Hello, is there some news about this bug? It is still happening in version
> 1.6.3. Thanks in advance!
Afaikt there's no news, sorry.

@Nate, Kevin: You seem to focus on default appearances. I don't think
they would fix this bug, can you explain how?

For my understanding we need to extend poppler so that it can generate and save 
appearance streams into the PDF file in a consistent way:
- either generate PDF operations from user image to draw image as paths
- or rasterize / convert user image to a sampled PDF image
- create AP structure, enter the generated image stream, enter additional 
resources
- update all resource references throughout the document
- save new and dirty objects

That all has not much to do with default appearances. Even if poppler
had hard coded default appearances for stamps, non-Okular readers would
not benefit from them unless the appearance is saved into the file,
which is currently not possible and which is the toughest part to
implement. And, "default" is quite the opposite to "custom" (as in the
bug title).

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https://bugs.launchpad.net/bugs/1859632

Title:
  Stamp annotations cannot be printed to pdf or "flattened"

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