Although it is possible to configure the stamp annotation or create a new one, the only choices are predefined. I would like to choose (or have available) a check-mark (✓) symbol, which is often useful when filling forms that are not actually PDF forms, just scans. Reproducible: Always
I would find creating stamp based on usual image formats also very useful. Aside from the PDF Form Barcode specification for adding a barcode into a PDF form using JavaScript I have from time to time the need to a barcode into a pdf file. This would easily done if I could create a stamp based on an image.
Another use case is inserting a scanned signature as an image to sign forms. As I've reported in related bugs the annotations should be also rescalable so that the barcodes, signatures or whatever can be correctly placed.
Here: https://bugs.kde.org/show_bug.cgi?id=159007 I have posted a link to a how to create personal annotations in okular. Unfortunaltely okular annonations are neither displayed in other PDF viewer nor are they printed. This makes this feature currently quite useless.
*** This bug has been marked as a duplicate of bug 159007 ***
*** This bug has been marked as a duplicate of bug 383652 ***