Question #688961 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/688961
RaiMan posted a new comment:
If you refer to the SikuliX source code in findChanges:
be aware:
Imgproc.cvtColor(findInput.getBase(), previousGray, toGray);
Imgproc.cvtColor(findInput.getTarget(), nextGray, toGray);
Core.absdiff(previousGray, nextGray, mDiffAbs);
Imgproc.threshold(mDiffAbs, mDiffTresh, PIXEL_DIFF_THRESHOLD, 0.0,
Imgproc.THRESH_TOZERO);
... mDiffAbs and hence mDiffTresh is grey (only one layer)
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