[sane-devel] meaning of "--contrast" option to backend

[m. allan noah]

depends on the scanner. more expensive models will change the lut the a/d 
uses inside the scanner. cheaper models will do this in the backend. which 
scanner/backend are you using?

allan

On Tue, 13 Jan 2004, Christopher Marshall wrote:

> I was just curious if specifying a contrast argument to the backend is different from doing a
> default scan and adjusting the contrast in the gimp after the scan.
> 
> I would imagine that it does mean something different in that you would be setting the contrast
> before the A/D step in the scanner if you specified such a parameter to the backend.  Using the
> gimp afterward to adjust the contrast would introduce additional quantization noise (over and
> above specifying it to the backend prior).
> 
> Am I right?  Or is the backend trying to save me an extra step (essentially a convienence
> feature)?
> 
> Chris Marshall
> 
> 
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