[sane-devel] Backend for plustek Opticbook 3600

[Chris Berry]

> 	Hello,
>
> 	regarding the gamma values you can extract the gamma tables sent to your
> scanner by the windows driver from USB logs. Put them in a spreadsheet, then
> you can insert the formula used by the genesys backend and compare the
> reference and generated curves.
>    

I am not sure at all how to get the gamma values from the snoop. After 
looking at some parsed logs there are no references to gamma values, but 
looking in the awk files (specifically the bulk_write_register) there 
should be some parsed output for them. Maybe I am using the wrong 
version of your awk files for this?

> 	For gain and offset, until calibration work I have nothing else to advise you
> than trial and error. But by choosing a black/white target, you may refine
> your tests. Scanned black areas should give values slightly above zero. If no
> raise the offset. Once tweaked, you can adjust gain until white areas give
> values of about 240 (0xF0).
>    
Ok ill try this once I have the correct gamma settings.
> 	For the release date I can't tell. Next release should be close. When your
> work should be terminated for your University course ?
>
> Regards,
> 	Stef
> 	
>
>    
I have about 3 weeks to finish the implementation really, after that the 
sooner the better for the release :).

Chris

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