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pextrem (1)
NAME
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pextrem - find minimum and maximum values in RADIANCE picture |
SYNOPSIS
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pextrem [ -o ] [ picture ] |
DESCRIPTION
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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. |
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The -o option prints the original (radiance) values,
undoing any exposure or color correction done on the
picture. |
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If no input picture is given, the standard input is
read. |
AUTHOR
BUGS
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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
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falsecolor(1), getinfo(1), pcomb(1), pcompos(1), pextrem(1),
pfilt(1), pflip(1), protate(1), psign(1), rpict(1),
ximage(1) |
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