Color Expression Node, replace pixels value

Nov 15

Color Expression Node, replace pixels value

Hi everyone,

I have read some topic about this subject but don’t find the solution about my problem (this one : http://www.vfxtalk.com/forum/nuke-cr…de-t17068.html )
I know we can add an "if" condition into the expression node with this syntax : if ? then : else and i would like to use it to replace some pixels value.

For example in the red channel i’ve tried that :

r>=1 ? 0 : r so i just want to replace the burned value by 0

The result is all pixels to 1 in the red channel

Here a copy/paste of the node :

Code:

Expression { expr0 "r>=1 ? 0 : 1" name Expression1 selected true }

I know in Fusion, we can use the Custom tool with this expression :
if(r1>=1,0,r1).

If you have the solution… thanks a lot !

Nuke version 6.1 v2 64bits

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