Comment 6 for bug 1859632

Okular 1.0.3 on Kubuntu 17.04

A few years ago, Okular gained the ability to save annotations into PDF files: https://bugs.kde.org/show_bug.cgi?id=151614

For the most part, it works great! There is one problem: custom/image stamp annotations are not saved in a way that can be printed or that other PDF readers can see. I tested many.

STEPS TO REPRODUCE:
1. Open a PDF file with Okular
2. Define a custom image stamp (Configure Okular > Annotations > Add > Stamp > enter a valid path to an image in the combobox)
3. Stamp your image into the document
4. File > Save As > Save the document somewhere
5. Use Okular to print the document or open it document in a non-Okular PDF viewer

EXPECTED RESULTS:
The image stamp is visible when the document is printed or viewed in a non-Okular PDF viewer

ACTUAL RESULTS:
The image stamp annotation is not visible In any of the non-Okular PDF viewers I had available: Adobe Acrobat, Foxit Reader, SumatraPDF, the PDF readers built into Firefox and Microsoft Edge. Acrobat reader can see and manipulate the *outlines* of the annotations, but the outlines have no images in them.

ADDITIONAL INFORMATION:
This affects a very common use case: wanting to add an image of the user's signature to a PDF document to sign it and send it back to them. When they open the file, the signature will not be visible unless they open it with Okular (unlikely).