[PD] Change color of a pixel

[Sean Harrigan]

Hi I am looking for a way to go through a video file and look at each pixel of each frame and analyze the RGB values.  I then want to be able to change the color of that pixel depending on criteria based on the RGB values.  I am trying to do something similar to the pix_grey object but want to be able to customize it with respect to what color to change the pixel.  Thank you for your time. 
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