--- ray/doc/man/man1/rpict.1	2022/10/19 21:25:20	1.28
+++ ray/doc/man/man1/rpict.1	2025/04/23 15:09:03	1.32
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rpict.1,v 1.28 2022/10/19 21:25:20 greg Exp $"
+.\" RCSid "$Id: rpict.1,v 1.32 2025/04/23 15:09:03 greg Exp $"
 .TH RPICT 1 2/26/99 RADIANCE
 .SH NAME
 rpict - generate a RADIANCE picture
@@ -271,6 +271,28 @@ to use a very small fraction with the
 .I \-pd
 option, to avoid the ghosting effect of too few samples.
 .TP
+.BI -pc " xr yr xg yg xb yb xw yw"
+Use the specified chromaticity pairs for output primaries and white
+point rather than the standard RGB color space.
+.TP
+.BR \-pRGB
+Output standard RGB values (the default).
+.TP
+.BR \-pXYZ
+Output standard CIE XYZ tristimulus values rather than RGB.
+.TP
+.BI -f \ source
+Load definitions from the file
+.I source
+and assign at the global level.
+The usual set of library directories is searched based on the
+.I RAYPATH
+environment variable.
+.TP
+.BI -e \ expr
+Set additional definitions from
+.I expr.
+.TP
 .BI -dj \ frac
 Set the direct jittering to
 .I frac.
@@ -699,6 +721,19 @@ continue rays with a probability equal to the ray weig
 divided by the given
 .I frac.
 .TP
+.BI -cs \ Ns
+Use
+.I Ns
+bands for spectral sampling rather than the default RGB calculation space.
+The maximum setting is controlled by the compiler macro MAXCSAMP, and
+defaults to 24.
+Larger values for Ns will be reduced to MAXCSAMP.
+.TP
+.BI -cw " nmA nmB"
+Set extrema to the given wavelengths for spectral sampling.
+The default is 380 and 780 nanometers.
+The order specified does not matter.
+.TP
 .BI -S \ seqstart
 Instead of generating a single picture based only on the view
 parameters given on the command line, this option causes
@@ -893,6 +928,8 @@ A value of zero turns automatic reporting off.
 Send error messages and progress reports to
 .I efile
 instead of the standard error.
+(Note this option overlaps with "-e expr" above, so file paths
+with '=' or ':' in them are not allowed on this option.)
 .TP
 .BR \-w
 Boolean switch for warning messages.