[sane-devel] Gamma tables causes distorsions : bug fixed ???

Aurelien Jarno ml at aurel32.net
Fri Oct 18 23:05:40 BST 2002


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Hi all,

A long time ago, there was a bug report submitted against sane 0.71-2 
via the Debian BTS. It was a problem with custom gamma table which 
causes undesired distortions :

| I have simply set the image intensity to about 1.5 and the red 
| intensity to about 1.2.  Whenever some very bright part of the 
| picture is scanned, it is not read in as white but rather as some 
| other color such as a light blue, yellow, green, or red.  The white 
| scanner background is almost a solid black.  This phenomenon persists 
| both in the prevue and the final scan.

The answer was :

| This problem is known:
| if you increase the size of the window in which the gamma-curve is  
| displayed it could get better!

I have looked up in the changelog and in the source code, the mailing 
list archives, and I haven't found any trace about a fix for this bug. 
However, I failed to reproduce this bug on my computer.

Did anybody remember if this bug was fixed or not ?

Thanks for your help,
Aurelien Jarno
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