I’m trying out an experiment in special effects using the Compositor, and I need a means of deriving a single numeric value from the information in the current frame’s scene, the idea being to modulate that number with Math nodes, then input that into Distortion nodes like Translate and Scale, so the image ultimately being produced is altered according to the infomration in the frame being rendered. For example, if I could covert the image to grayscale, blur the heck out it, then derive an average grayscale value for the entire scene, I could use that final value. The first 2 steps can be done with nodes, but I can’t seem to find a means of distilling it all down into a single number to use as a Value input in a Math or Distort node input.
Breaking out the RGB values comes close but is still an image and that doesn’t seem to affect the Distort nodes values. I guess it needs to be a single float.
I’d do a search but I can’t even begin to think of proper search term.
Thanks in advance for any suggestions.