AFNI program: immask
Output of -help
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
* Use of -mask mask_image means that only locations that are nonzero
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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