Radiance pextrem program

PEXTREM(1)                                                          PEXTREM(1)

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  expo-
       sure 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 cer-
       tain 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  reli-
       able  floating-point  comparison  would be slower by an order of magni-
       tude.

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)