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)