I own an Epson Perfection 3490 and I am beginning to use it with the CVS version of SANE (snapscan backend). While it seems to work well at resolutions up to 1200 dpi (but I did not yet perform really thorough testing), I noticed a kind of interlacing behaviour when scanning negatives/diapositives with the TPU at 3200 dpi. The scanlines are periodically offset from each other. Maybe it is alsoi present for the flatbed part, but I don't have such high resolution reflective stuff to test it out.
I would like to help the snapscand backend maintainer to fix the problem, as I would like to scan slides and negatives besides the usual flatbed content. What is needed in order to help as much as possible? I am thinking about scanning e.g. a small area with different resolutions and bit depths, then visually compare the results. But what should I do with these test images and the backend logs? I don't want to post binary data directly to the list for bandwidth reasons. Should I use the bug page at alioth? Levente
