Hello again.
I played a bit with arguments and results.
So I have got answers to some questions and will put them here:
1. The output file is the image. So I can use greyscale images with 4 bits (the maximum that my reader supports). Use the exact device resolution and DPI. And probably compression.
2. -om 0.03 fixed the issue.
3. Still can do nothing with that.
Have a good day.
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