[sane-devel] problem scanning slides with an EPSON 1670 Photo

[Oliver Schwartz]

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Hi,

> 1. all b/w pictures are too dark

This should be adjustable via brightness / contrast sliders in xsane. 
For best results you should use the sliders in the "standard option" 
window, the ones in the main window will only modify the image data 
after scanning.

It's possible, however, that these sliders do not work correctly for 
the epson 1670. There was a problem reported for gamma table download 
to the scanner which may cause troubles also for these settings.

> 2. the slide and film scan shown a pretty incorrect output (check
> http://eppesuigoccas.homedns.org/~giuseppe/scanner1670/ ) for two
> examples.

It seems that the scan area of the transparency unit is not set 
correctly in the SnapScan backend, but this only explains the red 
border on the right.

Another problem with the current implementation is the disabled 
(because not working) quality calibration. A fix is known in 
principle but has not yet been implemented. 

> 3. the major resolution of 1600 DPI isn't available.

This problem has been reported several times, so it seems to be for 
real :-) Unfortunately I've no idea how to fix it: To the best of my 
knowledge the code for this in snapscan-options.c looks correct.

> I would like to help the development of this driver, so my
> questions: are there epson specs for this scanner, is there
> anything that I may do?

The basic command set is covered in an older spec for the Agfa 
Snapscan 600. I'll send it in private mail.

Regards,

Oliver
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