On 6/9/2010 7:26 AM, clipka wrote:
> Am 09.06.2010 05:57, schrieb SharkD:
>> Any general guidelines on converting scenes created before assumed_gamma
>> or 3.7 were in wide use to the new defaults?
>
> That's a bit problematic: Before "assumed_gamma 1.0" or the most recent
> 3.7 betas, the color math was simply /wrong/. So in order to get exactly
> the same result, you'd have to mimick that wrong color math - which 3.7
> refuses to, except for legacy scenes using "#version 3.6" (or anything
> smaller than 3.7) and "assumed_gamma 2.2".
>
> If you do want to port the scene to the right math, here's what I expect
> to be the most important steps:
>
> (0) In the ini-file, set the "Display_Gamma" to whatever fits your
> system; set "File_Gamma" to the same. (Ideally, your system should have
> a Display_Gamma of 2.2.)
>
> (1) In the scene file, use "#version 3.7", and remove any
> "assumed_gamma" statement.
>
> (2) Gamma-adjust all color literals, by raising the R,G,B components to
> the power of 2.2 (or wait for the next beta, and add "gamma 2.2" to the
> color literal). Check your scene for colour values that are computed
> from some other values - you may (or may not) want to gamma-adjust these
> as well.
>
> (3) Check your scene for input image files, and whether they are handled
> properly regarding gamma. For images that are used as anything non-color
> (e.g. height field data, bump map, texture map or what-have-you),
> explicitly specify "file_gamma 1.0" after the filename (next beta will
> also support "gamma 1.0" here). For any images that do wind up being
> used as a colour, try the default first (i.e. no "file_gamma"
> statement); if the colours appear too washed-out or too strong, try
> explicitly specifying "file_gamma srgb".
>
> (4) Toy around with overall brightness and/or brightness of individual
> light sources, until you feel comfortable with the illumination. You may
> also want to tweak some of the colours in your scene (both pigment and
> light sources). If you're using self-made input image files, you may
> also want to tweak their file_gamma setting, but try to avoid this with
> 3rd party input images (you should usually find a way to make them work
> by tweaking the scene rather than the image).


Mind if I copy your post to the wiki?

-- 
http://isometricland.com

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