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Comparing ray/doc/man/man1/pcompos.1 (file contents):
Revision 1.6 by greg, Mon May 17 18:02:24 2010 UTC vs.
Revision 1.8 by greg, Tue Mar 15 00:25:50 2022 UTC

# Line 143 | Line 143 | option will cause each image to be separated by at lea
143   The
144   .I "\-o x0 y0"
145   option specifies a nonzero anchor point for the bottom left image.
146 + If a negative value is given for ncols, then the rows are reversed,
147 + so they start from the top rather than the bottom.
148 + This gives a more natural ordering in most cases, but has the
149 + side-effect of moving any labels from the upper-left of each placed
150 + subimage to the lower-left.
151 + Also, the
152 + .I \-o
153 + option is interpreted differently, where the y0 value is number of
154 + pixels from the top (rather than the bottom).
155   .PP
156   The standard input can be specified with a hyphen ('-').
157   A command that produces a RADIANCE picture can be given in place of a file
# Line 152 | Line 161 | To put a copyright label at the bottom of a picture:
161   .IP "" .2i
162   psign Copyright 1987 | pcompos inp.hdr 0 0 +t .5 - 384 64 > out.hdr
163   .PP
164 < To make a catalog of images separated by white 10-pixel borders:
164 > To make a catalog of images separated by white 10-pixel borders and
165 > ordered four images per row starting from the top-left:
166   .IP "" .2i
167 < pcompos \-la \-a 4 \-s 10 \-b 1 1 1 dog*.hdr > alldogs.hdr
167 > pcompos -la -a -4 -s 10 -b 1 1 1 dog*.hdr > alldogs.hdr
168   .SH NOTES
169   Since there is a limit to the number of open files and processes,
170   large collections of images must be created in stages.
# Line 165 | Line 175 | processes.
175   .SH AUTHOR
176   Greg Ward
177   .SH "SEE ALSO"
178 < getinfo(1), pcomb(1), pfilt(1), psign(1), rpict(1)
178 > getinfo(1), pcomb(1), pfilt(1), psign(1), rcrop(1), rpict(1)

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