I tried several times to define the min/max-values for the rgb-display under properties>style: Benutzer min/max-Werte (user min/max-values) but it is not working. By chance it worked once but now it is not working anymore. The other functions as to invert the color representation or the selecton of the channel are working, hm.
The raster file are created by the following process: Scanned as an pdf>imported in photoshop cs5 (modus rgb)>saved as (in photoshop) tif (color profile not embedded, respectivel sRGB IEC61966-2.1 not activated).
Does anybody have an idea where the problem is? Thank's in advance! phil