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return the number of non-null pixels of an image More...
return the number of non-null pixels of an image
Usage: area in.pgm [out.list]
Description: This function returns (in the list out.list) the number of non-null pixels of the image in.pgm .
If the parameter out.list is ommitted, the result is printed on the standard output.
Types supported: byte 2d, byte 3d, int32_t 2d, int32_t 3d, float 2d, float 3d
Category: arith
1.7.3