Follow-up Comment #12, bug #66114 (group groff): The presence/absence of embedded images can be derived from capturing warnings during the run. This will inform if file/identify/pdfinfo (assuming some of them are accessible) has failed, but it is only through opening the pdf that you can be sure gropdf has correctly identified the image and embedded it correctly.
I envisaged the images would be generated by me and would just be a small box
with text which identifies the format, colourspace, bit depth, and whether it
includes transparency. I.E. Png sRGB 8 no. The produced document would contain
all the box images, each one has a text caption which describes the image. If
the image is missing the caption will tell you which image failed.
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