Usage: immask [-thresh #] [-mask mask_image] [-pos] input_image output_image * Masks the input_image and produces the output_image; * Use of -thresh # means all pixels with absolute value below # in
input_image will be set to zero in the output_image
in the mask_image will be nonzero in the output_image
Use of -pos means only positive pixels from input_image will be used
At least one of -thresh, -mask, -pos must be used; more than one is OK.
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