SYNOPSISpextrem [ -o ] [ picture ]
DESCRIPTIONPextrem locates the minimum and maximum values for the input picture, and prints their pixel locations and color values. The first line printed contains the x and y pixel location (x measured from the left margin, y measured from the bottom), followed by the red, green and blue values. The second line printed contains the same information for the maximum value.
The -o option prints the original (radiance) values, undoing any exposure or color correction done on the picture.
If no input picture is given, the standard input is read.