[sane-devel] Backend for plustek Opticbook 3600

[Chris Berry]

stef wrote:
> Le lundi 22 février 2010 15:09:11, vous avez écrit :
>   
>> On 02/22/2010 06:43 AM, stef wrote:
>>     
>>> Le lundi 22 février 2010 02:09:14 Chris Berry, vous avez écrit :
>>>       
> ...
>   
>> Hey Stef,
>>
>> Thanks for the awk script, helped a lot. I put the values into a
>> spreadsheet and got gamma values all around 1.0 so I didnt really need
>> to alter them at all, but it gives me something to talk about in my
>> report :). I have tweaked the gain and offset (offset is largely ignored
>> for AD type frontend it seems so I added a similar AD_OFFSET_CALIB
>> function to gl841) and now the picture seems right with the original
>> shading issues.
>>
>> So now I need to alter the shading as the shading files are still
>> showing really odd things. How do I adjust these? I imagine I need to
>> find the calibration area in some way but im not sure how I do this?
>>
>> After the shading is corrected I think I should be ready to test, is
>> there any formal testing procedure with SANE? There are a couple of
>> people who are awaiting this scanner backend and have agreed to help
>> testing so I will get it to them in some way. Im also going to sort my
>> patch out and get rid of any whitespace or other rubbish ;)
>>
>> Cheers
>>
>> Chris
>>
>>     
> 	Hello,
>
> 	The shading calibration area is 'under the roof', it is located inside the 
> scanner. You can have a picture of it by doing a scan after setting physical y 
> offset to 0. ie you scan from parking position.
>   
Sorry I wasnt very clear with this, I know where the shading area is I 
just dont know how to alter where the backend reads the shading data 
from. At first I thought it was in the genesys_device struct in the 
white strip/ black mark section but that seem to make no affect.

Hopefully I can fix this by tomorrow and start testing

Chris