[Rossi Vitello]"so now i want some kind of histogram information of the resulting edges only image for my expression, a single value of how the image is more black or white. can i get that somehow, or do you have any completely different idea of how to get a value for the blurriness/sharpness of the frame? sampleImage function didn't really help me... but maybe there's some way..."
sampleImage is averaged, so I can imagine that it wouldn't really give you the data you're looking for. What about iterating through a series of small samples and keeping a running total of the brightness of each sample?
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