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Comparing ray/doc/man/man1/pcomb.1 (file contents):
Revision 1.10 by greg, Mon Feb 5 20:07:17 2018 UTC vs.
Revision 1.12 by greg, Fri Mar 18 21:09:16 2022 UTC

#	Line 42 | Line 42 | but an arbitrary mapping can be assigned with the
42		and
43		.I \-f
44		options.
45	+	The variable and function definitions in each
46	+	.I \-f source
47	+	file are read and compiled from the RADIANCE library where it is found.
48		Negative coefficients and functions are allowed, and
49		.I pcomb
50		will produce color values of zero where they would be negative.
#	Line 115 | Line 118 | give the exposure values for picture
118		and
119		.I pa(n)
120		gives the corresponding pixel aspect ratio.
121	+	Exposure values will be set to 1.0 for inputs with the
122	+	.I \-o
123	+	option set.
124		Finally, for pictures with stored view parameters,
125		the functions
126		.I "Ox(n), Oy(n)"
#	Line 217 | Line 223 | pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.hdr >
223		To make a picture of a dot:
224		.IP "" .2i
225		pcomb \-x 100 \-y 100 \-e 'ro=b;go=b;bo=b;b=if((x-50)^2+(y-50)^2\-25^2,0,1)' > dot
226	+	.SH ENVIRONMENT
227	+	RAYPATH         the directories to check for auxiliary files.
228		.SH AUTHOR
229		Greg Ward
230		.SH "SEE ALSO"

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