Warp schrieb:

>   There should be a way for the user to specify an assumed gamma for input
> images, so for PNGs with no gamma information at all, the user-defined
> assumed gamma should be used.

Ah... yes, indeed. You might want to read my OP on this topic :-P.

>   Of course if the user has not specified an assumed gamma for the input
> image either, then the default should probably be Display_gamma (ie. so that
> the image will look in POV-Ray the same it looks when viewed with some
> image viewing program).

I had thought about a gamma of 2.2 (to closely match sRGB), or the 
File_Gammma INI setting (so that previously rendered images will be read 
in properly). But you're making a point there, too.

Thinking about it, I'd suggest to go for File_Gamma: Usually the user 
will not only expect the input files to look in the render preview as 
they did in his image viewer, but he will also expect the output file to 
look in his image viewer as it did in the preview, so he will typically 
set both Display_Gamma and File_Gamma to the same value anyway. However, 
in case the user is viewing files on a different machine (having a 
different gamma) that he is running POV-Ray on, or if his display 
hardware and OS have an awkward gamma but his viewing software is well 
calibrated, the user would set the two parameters differently, and in 
this case File_Gamma would be the better bet for input files.

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