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View Full Version : What is "Value" in HSV?


marcuso
07-10-2010, 12:09 AM
Hey all,

I'm trying to figure out what the viewer indicator for "Value" is really telling me. That thing at the bottom of the viewer. It's showing me the R, G and B values, as well as H,S,V and L. Lightness gives me the average of RGB, as it should. An RGB value of 0.5 however, returns V=0.74, while a RGB=0.21404 returns me a V=0.5.

Putting down a new Constant node with the V set to 0.5, gives me a 0.74 in the viewer.

I'm guessing there's some gamma:ing going on somewhere. What am I missing?

edit: oh, and I'm talking about 16-bit images, if that matters.

ndeboar
07-14-2010, 01:55 AM
wikipedia is your friend:
http://en.wikipedia.org/wiki/HSL_and_HSV

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07-14-2010, 01:55 AM
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