Hi, On 2020-09-12 3:02 p.m., Charles Lindsey wrote: > > > On 09/09/2020 15:51, Charles Lindsey wrote: > >> >> What it Didn't say (and it took me several hours to find out) is that >> you then have to say >> >> sudo apt-get install libsane=1.0.31 >> >> after which it seems to have worked (well, I have scanned the same >> document 6 times without problem). Now to get the gamma correction >> sorted out - but that can wait till tomorrow. > > I seem to have spoken too soon. I was testing it with Simple Scan. > > But when I tried Xsane and took a preview, the problem was back again. > (Xsane is at version 0.999 if that helps). > > Oddly, when I did a full scan with Xsane, it came out correct. But I > really need the preview facility in order to find the proper gamma > settings. I have a nice test chart and the three test probes in the > preview should make that much easier. >> >> So thanks for all your help. >> >
I have a 1260 so tests that I do with that might well be reproduceable on my machine. When I looked at a similar issue previously, I did manage to reproduce the vertical banding, but found that the latest version of SANE at that time did not exhibit the issue. Instead, there was a bug in the calibration computation that led to some images being unusually dark. This was also diagnosed and fixed. Could you send me a copy of an image with the issue, if it is possible? A screen cap might be OK, just to get a feeling for what you are seeing. Cheers, Ralph
