pearson_correlation
No arguments
Description:
Compute pearson-correlation using two-by-two selected images.
Example of use:
$ gmic sp tiger +shift -30,-20 pearson_correlation text. {_${}},0,0,20%,1,255,255,255

Command: sp tiger +shift -30,-20 pearson_correlation text. {_${}},0,0,20%,1,255,255,255

Command: sp tiger +shift -30,-20 pearson_correlation text. {_${}},0,0,20%,1,255,255,255