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Comparing ray/doc/man/man1/pcomb.1 (file contents):
Revision 1.8 by greg, Tue Sep 4 17:36:40 2007 UTC vs.
Revision 1.10 by greg, Mon Feb 5 20:07:17 2018 UTC

# Line 140 | Line 140 | If the current pixel is outside the view region,
140   will return a negative value, and
141   .I S(n)
142   will return zero.
143 + The first input picture with a view is assumed to correspond to the
144 + view of the output picture, which is written into the header.
145   .PP
146   The
147   .I \-h
# Line 206 | Line 208 | pcomb pic1 \-s \-1 pic2 > diff
208   .PP
209   To precompute the gamma correction for a picture:
210   .IP "" .2i
211 < pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' pic > pic.gam
211 > pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' inp.hdr > gam.hdr
212   .PP
213   To perform some special filtering:
214   .IP "" .2i
215 < pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.pic > filtered.pic
215 > pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.hdr > filtered.hdr
216   .PP
217   To make a picture of a dot:
218   .IP "" .2i

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