doesn't it what the curveTool node is doing already ??? have you tried
that ?
it return you the average of your ROI in the pict.
PS : be careful, there is a bug in nuke6.3 the ROI resize itself to the
full picture all the time. very anyoning but you can use a crop before
in the meantime
olivier
Lev Kolobov wrote:
I'm actually surprised too, because you can drag select area in viewer
and will give you an average instantly. How does it work? Why the
average tool is so complicated to do.
Nathan Rusch wrote:
I actually ended up writing a plugin to do this, though it currently
operates in-line on RGB only. Chances are it could be made more
efficient somehow, but it works. If there aren’t any other elegant
solutions out there, I can see about getting the go-ahead to release
it and post it on Nukepedia (and maybe spruce it up a bit first). And
as fair warning, I can only build for Linux and Windows.
Side note: I was pretty surprised Nuke didn’t have a good built-in
solution for this.
-Nathan
*From:* Jordan Olson <mailto:[email protected]>
*Sent:* Wednesday, August 31, 2011 5:06 PM
*To:* Nuke Python discussion
<mailto:[email protected]>
*Subject:* [Nuke-python] quickly average non-zero pixels?
hi fellow TDs!
I'm working on a gizmo atm- and am trying to figure out the best way
for this.
I'd like to find the average non-zero value of a channel on the
current frame. (working with depth and motion blur)
The slowest way I can imagine doing it is to run nuke.sample() on
every pixel with an if statement, to eventually average the non-zero
(or alpha) pixel values together. Surely there's a better way to do
it? Ideally this should happen on every frame transparent to the comper.
Cheers,
Jordan
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