[sane-devel] Genesys, Canon LiDE 35/40/50/60

Pierre Willenbrock pierre at pirsoft.dnsalias.org
Tue Apr 25 22:12:45 UTC 2006

Hi Gerald,

Gerald Murray schrieb:
> Tested:
> LiDE 35: 150,300,600,1200 using usb-1.1.
> Motor ok.  Scans at 150,300 are excellent quality.  
> At 600, 1200 minor image flaws: there is faint but noticable streaks
> down the longest length of the image, from color reception or brightness
> not being quite right.

That is probably a calibration problem. There is no easy way to fix
that. What helped Henning was to clean the calibration area. The backend
is currently not able to cope with (much) dirt there. You can get a
distorted raw scan of the calibration area by enabling debugging. That
should give you a file named "black_white_shading.pnm". When scanned at
the higher resolutions(>=600dpi), it should have vertically striped
area(s), but only very few dirt particles.

> Also a few slices across the image, possibly from a
> jerk of the head at that point in the scan.  On the whole, an acceptable
> image.

Did this happen because the scanner moved the head back to restart at
the buffer overflow position? If that is the case, i need to do some
more tuning on the acceleration tables. That should definitely not
happen(Though it is no reason not to put the code into sane-backends).

> HP2400: no change, not working.

Not working as in "refuses to move head/deliver useful data" or as in
"provides a 2400x1200dpi image"? For the latter case i do have a patch,
enabling a nearest match interpolation.

Thanks for testing,

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