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[RaiMan <question688961@xxxxxxxxxxxxxxxxxxxxx>]

Question #688961 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/688961

RaiMan posted a new comment:
--- about subtract (from the OpenCV docs):

Difference between two arrays, when both input arrays have the same size and the same number of channels:
dst(I)=saturate(src1(I)−src2(I))

... and saturate exactly means: results <0 to null and >255 to 255.

---  if it is < 0, it will from 255 again
is wrap-around

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