oops you are right chris I have been using good profiles for so long for my cameras I total forgot sRGB is horrid. http://www.brucelindbloom.com/RGB16Million.html Randy S. Little http://www.rslittle.com
On Sun, Jan 1, 2012 at 05:31, chris <[email protected]> wrote: > 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 > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
