[Sidefx-houdini-list] COPS - Average Colour Luminance in Image

Pete Wallace pies4peter at hotmail.com
Fri Apr 20 18:30:48 EDT 2007

aha!   of course,   i should have noticed too  :)
Thanks for the tip Mark.
Cheers PeterB
As you can probably guess, i'm trying a video-clips>cops mozaic process,
- maybe once i've tidied it up i'll get it honked onto the Exchange.
Luminance is enough for now, but i hope to get a proper RGB lookup going sometime.
I'm sure CHOPs will have a massive hand in it!
> > > Ah, right. I forgot to mention you should run it through a Mono COP > first to change RGB -> lum, and then just read the Red channel into > CHOPs. It's 3x higher than normal because of the 3 RGB channels. Sorry, > forgot about that :) At least that should reduce the 0.05 error to > around ~0.01, which is probably acceptable.> > M.

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