clipka <ano### [at] anonymousorg> wrote:
> Am 06.03.2018 um 00:02 schrieb Kenneth:
> > Now, a newer test scene shows no
> > difference-- producing the same 'linear' height_field slopes no matter what
> > gamma the images are saved at...
>
> By default, when using images in a height_field, POV-Ray presumes that
> the image data is to be taken linearly no matter what gamma the file
> claims to match, e.g. in an 8-bit image a data value of 240 will always
> be interpreted as a height of 240/255, even if the file claims to be
> saved for a display gamma of 2.2.
>
> So if you just create an image in Photoshop and /assign/ a particular
> gamma to it later, there will be no difference as the image data will
> not change. You'd need to /convert/ the image from one gamma to another
> to see an effect.

Thanks. My older test scene was also more complicated-- using a HF-image gamma
*and* a pigment_map with a blend mode/blend gamma. That combination probably
confused the result for me.

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