Hello,

I would like to know if there is a way of reading the resulting pixel 
value in the rendered image as it is being rendered and if it is 
possible to overwrite it with another value. Possibly based on the 
original color.

This is for testing lighting on a scene. If the color at the pixel is 
above a certain value it should be marked with another color and would 
let me know that the image is being saturated with too much light. Not a 
scientifically rigorous method but it works well for most cases.

I can do this manually by just rendering, in EXR or HDR format, the 
scene using only a simple diffuse white material for all. Then, after 
rendering, load the render into a high-dynamic image viewer or editor to 
see if there are any places on the scene that are too bright.

I already looked at ImageMagick but it just overkill for what I need.



FlyerX

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