Not readable colors on "Image Intensity" dialog
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ra28145
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Your description had me confused for a bit, as I haven't directly defined an "Image Intensity" dialog in gscan2pdf. I think what you are seeing, though, is the dialog when trying to change the "Image Intensity" scan option, and rather than there being a single value, like an integer or a string, which can be displayed as a drop-down or similar, you have an option that is expecting a list of values.
I've never owned a scanner that had such options, and so have never been able to test them directly, and you are the first to ask about one.
Please start gscan2pdf from the command line with the --log=log option, reproduce the problem, quit and post the log file, which gscan2pdf has probably compressed to .xz, then I'll see if I can mock up your problem here for me to improve the dialog.
There is a some sort of graph. I made also a short video to show it. Here is a log.
And here is the screen video.