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

Peter Bowmar pbowmar at gmail.com
Thu Apr 19 14:10:28 EDT 2007


Hey Pete,
    Mark A showed me a cool way of doing this using CHOPs. Read the
whole image into CHOPs then... do something which I've forgotten :(
Math CHOP set to Average or something? Sorry, forgotten off the top of
my head but it turned out to be pretty easy and fast.

Cheers,

Peter B

On 19/04/07, Pete Wallace <pies4peter at hotmail.com> wrote:
>
> Hello chaps,
>       Does anyone know a good way of extracting the average luminace across a whole image in COPs?
> I've tried using picni to grab CLUM - of the same image scaled to 1x1 pixel,  and that worked with flat colours of course
>
>   but in practice - when i'm trying to use video images, I frequently get really unrepresentative values.
> Should i be blurring or something to avoid the scale filter diving into dark values?
> Or is there a better way...
>
> cheers,
> Pete
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