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.\" RCSid "$Id$"
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.TH PEXTREM 1 11/15/93 RADIANCE
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.SH NAME
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pextrem - find minimum and maximum values in RADIANCE picture
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.SH SYNOPSIS
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.B pextrem
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[
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.B \-o
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]
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[
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picture
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]
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.SH DESCRIPTION
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.I Pextrem
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locates the minimum and maximum values for the input
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.I picture,
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and prints their pixel locations and color values.
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The first line printed contains the x and y pixel location
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(x measured from the left margin, y measured from the bottom),
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followed by the red, green and blue values.
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The second line printed contains the same information for the
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maximum value.
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.PP
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The
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.I \-o
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option prints the original (radiance) values, undoing any exposure
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or color correction done on the picture.
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.PP
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If no input
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.I picture
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is given, the standard input is read.
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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The luminance value is used for comparison of pixels, although in
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certain anomolous cases (ie. highly saturated colors) it is possible that
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.I pextrem
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will not pick the absolute minimum or maximum luminance value.
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This is because a fast integer-space comparison is used.
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A more reliable floating-point comparison would be slower by
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an order of magnitude.
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.SH "SEE ALSO"
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falsecolor(1), getinfo(1), pcomb(1), pcompos(1), pextrem(1), pfilt(1),
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pflip(1), protate(1), psign(1), rpict(1), ximage(1)
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