Assuming that a greenscreen was unevenly lit – a fairly common problem - the basic concept of this approach is to determine the pixel-by-pixel difference between the greenscreen you have and the greenscreen you wish you had, and then to apply a pixel-by-pixel correction using Merge node arithmetic.
Using Merge Arithmetic to Correct Uneven Greenscreens
Updated: 8 March 2025
Author: GPStuart
Compatible Nuke versions: 11.0 or later
Compatibility:
USING MERGE ARITHMETIC TO CORRECT UNEVEN GREENSCREENS (OR BLUESCREENS, OR WHATEVER…) Assuming that a greenscreen was unevenly lit – a fairly common problem - the basic concept of this approach is to determine the pixel-by-pixel difference between the greenscreen you have and the greenscreen you wish you had, and then to apply a pixel-by-pixel correction using Merge node arithmetic.