The fact that you can reproduce this with the scanimage frontend means that the bug is not in gscan2pdf, but with the Canon backend.
Which package is providing the Canon backend?
The possibilities are libsane directly, or a package provided by Canon. Either way, the following command from the CLI should demonstrate the problem to the maintainer:
The fact that you can reproduce this with the scanimage frontend means that the bug is not in gscan2pdf, but with the Canon backend.
Which package is providing the Canon backend?
The possibilities are libsane directly, or a package provided by Canon. Either way, the following command from the CLI should demonstrate the problem to the maintainer:
scanimage --device- name='pixma: 04A91746_ EABCEA' --mode='Color' --source='Flatbed' -y 297 -l 0 --resolution='150' -x 210 -t 0 --batch