AFNI program: imcalc
Output of -help
Do arithmetic on 2D images, pixel-by-pixel.
Usage: imcalc options
where the options are:
-datum type = Coerce the output data to be stored as the given type,
which may be byte, short, or float.
[default = datum of first input image on command line]
-a dname = Read image 'dname' and call the voxel values 'a'
in the expression. 'a' may be any letter from 'a' to 'z'.
** If some letter name is used in the expression, but not
present in one of the image options here, then that
variable is set to 0.
Apply the expression within quotes to the input images,
one voxel at a time, to produce the output image.
("sqrt(a*b)" to compute the geometric mean, for example)
-output name = Use 'name' for the output image filename.
See the output of '3dcalc -help' for details on what kinds of expressions
are possible. Note that complex-valued images cannot be processed (byte,
short, and float are OK).
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Mon Oct 19 20:25:01 EDT 2020