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Image luminance and Luminance Channel?
show user profile  Nanne
Hello mates.

Here's something I haven't quite gotten my head wrapped around yet. What is the luminance of an image and what is the Luminance Channel that many compositors are talking about?

Here is my best guess so far:

First of; there isn't an actual luminance channel, there are just the R, G and B channels. The Luminance is the average of these three channels values (per pixel, of course), like so:

(R + G + B) / 3 = L

How's my guess? :)

Kristoffer Helander
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read 256 times
6/22/2010 9:24:15 AM (last edit: 6/22/2010 9:24:15 AM)
show user profile  Bolteon
lume is lume, whatever they call it... there's no real channel for it usually.

and yes, rgb/3 gets you lume.

-Marko Mandaric

read 220 times
6/23/2010 6:35:16 AM (last edit: 6/23/2010 6:35:16 AM)
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