NAME

       pextrem - find minimum and maximum values in RADIANCE picture

SYNOPSIS

       pextrem [ -o ] [ picture ]

DESCRIPTION

       Pextrem  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.

AUTHOR

       Greg Ward

BUGS

       The  luminance  value  is  used for comparison of pixels, although in certain anomolous cases (ie. highly
       saturated colors) it is possible that pextrem will not pick the absolute  minimum  or  maximum  luminance
       value.   This  is  because  a  fast  integer-space  comparison  is  used.  A more reliable floating-point
       comparison would be slower by an order of magnitude.

SEE ALSO

       falsecolor(1), getinfo(1), pcomb(1), pcompos(1), pextrem(1), pfilt(1),  pflip(1),  protate(1),  psign(1),
       rpict(1), ximage(1)

RADIANCE                                            11/15/93                                          PEXTREM(1)