[sane-devel] how should you determine a good gamma correction to use through the backend?

[Christopher Marshall]

--- Karl Heinz Kremer <khk at khk.net> wrote:
> >
> Profiling the scanner will not solve the gamma correction problem: 
> Before you profile your scanner you need to pick a gamma value. After 
> that, you always have to select the same gamma value whenever you scan. 
> Otherwise your profile will not be able to correct your colors. This 
> means that the better your scans are before you apply a profile 
> (because you selected a good gamma value), the better the final 
> corrected scans will be.
> 
> Karl Heinz
> 

Karl:

Well, I suppose I was thinking of doing a scan with a correction of 0 (the default I believe),
calculating a value of k, and using that value in further scans.

Are you suggesting a iterative approach, where you start out uncorrected (k=0), calculate k1, scan
with k1, calculate k2, then scan with k2, and so on to a point of diminishing returns?

Chris Marshall


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