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first, your mask should have a single CV_8U channel, not 3
then, i think, this is a typo:
if (mask.ucharPtr(i, j)[0] == 255) {
did you mean to check newmask instead ?
and last, i have no idea what you get from cv.imread("canvasAdjust"); , but if it's a real world image, chances are low, that your "exact" conditions will fire