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pextrem - find minimum and maximum values in RADIANCE
picture
pextrem [ -o ] [ picture ]
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.
Greg Ward
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.
falsecolor(1), getinfo(1), pcomb(1), pcompos(1), pextrem(1),
pfilt(1), pflip(1), protate(1), psign(1), rpict(1),
ximage(1)
Header and Footer
PEXTREM(1) RADIANCE (11/15/93) PEXTREM(1)
Page 1 (printed 7/17/96)
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