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Comparing ray/doc/man/man1/pvalue.1 (file contents):
Revision 1.5 by greg, Fri Oct 1 07:45:30 2004 UTC vs.
Revision 1.6 by greg, Tue Sep 4 17:36:40 2007 UTC

#	Line 210 | Line 210 | options determines whether the scanlines are sorted al
210		x or along y.
211		Most Radiance pictures are sorted top to bottom, then left
212		to right.
213	<	This corresponds to a specification of the form "-y yres +x xres".
213	>	This corresponds to a specification of the form "\-y yres +x xres".
214		Either an upper or lower case 'X' may be used for this option.
215		Like the
216		.I \-y
#	Line 220 | Line 220 | options have no effect for forward conversions.
220		.SH EXAMPLE
221		To look at the original, unique pixels in picture:
222		.IP "" .2i
223	<	pvalue -o -u picture | more
223	>	pvalue \-o \-u picture | more
224		.PP
225		To convert from a 512x400 8-bit greyscale image in bottom to top,
226		left to right scanline ordering:
227		.IP "" .2i
228	<	pvalue -r -db -b -h +y 400 +x 512 input.im > flipped.pic
228	>	pvalue \-r \-db \-b \-h +y 400 +x 512 input.im > flipped.pic
229		.br
230	<	pflip -v flipped.pic > final.pic
230	>	pflip \-v flipped.pic > final.pic
231		.SH AUTHOR
232		Greg Ward
233		.SH BUGS

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