[sane-devel] cropped stripes in big scans?

[Yury Tarasievich]

I was checking a batch of grayscale scans made 
couple of years ago with Canon LIDE 25, and I 
have a suspicion that on full A4-format scans 
driver+sane (linux 32 bits, as compiled ca.2011) 
could produce height-reduced (cropped) stripes 
in image, spaced like something 20-25% of full 
length.

Is such a problem known?

Now, I'm not sure all those scans were affected. 
Is it possible the machine load was influencing 
the result, or something else was? How to test 
for such condition? I still own this scanner, 
using it for lesser grade scans, but crops in 
graphics wouldn't be so acceptable anyway.

Thanks
Yury