On 22-5-2016 16:34, Kenneth wrote:
> Ive <ive### [at] lilysoftorg> wrote:
>
>>
>> When using images as depth-map, or bump-map, or heightfield, or anything
>> else that has nothing to do with a "picture" you'll have to make sure
>> that there is at no point in the whole workflow any gamma correction
>> applied - starting with the generation of the image itself.
>> Simply changing the gamma later is not what you want as this will throw
>> away a lot of information and you will loose detail.
>>
>
> Yes, I agree with that... to a point. My little gamma trick was just an
> experiment-- which happened to work out rather nicely. But I would not recommend
> changing gamma willy-nilly (without an understanding of the problems it will
> introduce.) In the case of Thomas's "mapping test" image, it certainly *did*
> introduce a problem--- the ears of his model disappeared! ;-) But it was
> interesting to see how the gamma shift 'improved' the facial features of his
> isosurface, without any other code changes.
>
> My own overall philosophy about POV-Ray is that it is a wonderful 'visual tool
> box'... with tools that can be used in various ways (even 'non-recommended'
> ways, if that happens to work for a certain effect.) I recall that when I first
> started using the program, the one thing mentioned over and over again in the
> newsgroups was, "Don't be afraid to experiment and see what happens!" I still
> think that's a useful philosophy to have.
>
>

I agree with Kenneth: while the rules are there to be followed 
strictly... they need also to be broken when artistic needs call for it 
and yield interesting results.

-- 
Thomas

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