Warp schrieb:
>   Also POV-Ray 3.7 displaying the image on screen with one gamma setting
> (with Display_Gamma is set) and writing the file with a completely different
> gamma setting is a problem.

It only is a problem if you set the Display_Gamma value wrong, or set 
the File_Gamma value to a nonstandard value with a file format not 
supporting embedded gamma information.

>   Btw, a Display_Gamma of 1.0 produces (on screen) an image which is
> basically identical to what POV-Ray 3.6 produces, all image_maps look
> correct, etc. Is there a reason why it cannot be the default?

Yes, there is: It's perfectly wrong for most systems.

Did you ever try it out with a scene to test your workflow for gamma issues?

Just set up a scene with a thin-horizontally striped (or, if you have an 
LCD display, checkered) black-and-white background and some rgb 0.5 
object for comparison, using ambient-only materials.

Such a scene /should/ look perfectly homogenous when you squint you 
eyes. If it doesn't, your workflow doesn't handle gamma properly.

(Similarly, the output of such a scene, used as input for another scene 
and heavily blurred by focal blur or anti-aliasing, should appear 
homogenous as well; this is where POV-Ray currently does a poor job.)

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