hi randy,
i'm not sure i understand your problem correctly...
it seems that you'd expect a 0.18 gray in linear to result in
0.5 in sRGB. however, all the conversion formulas that i know of
define 0.18 to be mapped to 0.4618.. which is exactly what
nuke's color space node is doing. and obviously this means 0.5
in sRGB translates to around 0.21 in linear then.
On 12/31/11 at 10:34 PM, (Randy Little) wrote:
As expected when using a gamma node on a raw sRGB since
srgb is a power curve.
sRGB is a linear curve for low values, and a modified power
curve after a certain breakpoint.
i've found charles poyntons articles always very helpful when
trying to grasp those problem. he seems to have removed his full
articles, but there's still some good info:
http://www.poynton.com
http://www.poynton.com/notes/PU-PR-IS/Poynton-PU-PR-IS.pdf
http://www.poynton.com/PDFs/GammaFAQ.pdf
and the wiki articles help too:
http://en.wikipedia.org/wiki/Color_space
http://en.wikipedia.org/wiki/SRGB_color_space
++ chris
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