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)
