[sane-devel] Backend for plustek Opticbook 3600

[Pierre Willenbrock]

stef schrieb:
> Le mercredi 24 février 2010 03:00:16 Chris Berry, vous avez écrit :
>> Hey Stef,
>>
>> I think I have sorted out the white shading data but the black is still
>> a mystery. I have uploaded some files to the project site (here
>> http://sites.google.com/site/bez625/updates-1/update240210 ) these are
>> at shading lines set to 400 but for the scan to work even a little bit I
>> needed to change the lines to 20 (this removes the light blue lines at
>> the bottom of the white_shading.pnm).
>>
>> As you will be able to see the black_shading400.pnm is all white, I have
>> no idea how to alter this. You can see from the white_shading400.pnm the
>> full calibration area so I am at a loss really. Have you encountered
>> this problem before?
>>
>> Thanks
>>
>> Chris
>>
> 	Hello,
> 
> 	judging from the 2 pictures, there is no black area to scan. You should then  
> rather use the GENESYS_FLAG_DARK_WHITE_CALIBRATION (like the lide 35) flag 
> instead of GENESYS_FLAG_DARK_CALIBRATION. The shading data will be taken from 
> an all white area and black data will be inferred from the small black areas 
> still in the picture.
> 	

GENESYS_FLAG_DARK_WHITE_CALIBRATION is just a way to scan the black and
white strip in one go. Chris, you should try to figure out if the
backend goes through genesys_dark_shading_calibration with
GENESYS_FLAG_DARK_CALIBRATION, and if so, why the lamp does not switch off.

Regards,
  Pierre