--- ray/doc/man/man1/pvalue.1	2019/07/15 23:42:44	1.10
+++ ray/doc/man/man1/pvalue.1	2024/09/11 18:56:11	1.13
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: pvalue.1,v 1.10 2019/07/15 23:42:44 greg Exp $"
+.\" RCSid "$Id: pvalue.1,v 1.13 2024/09/11 18:56:11 greg Exp $"
 .TH PVALUE 1 1/15/99 RADIANCE
 .SH NAME
 pvalue - convert RADIANCE picture to/from alternate formats
@@ -53,8 +53,9 @@ turns this option off, which is the default.
 .BR \-o
 Print original values, before exposure compensation.
 If the input file is in XYZE format, the Y (green) channel
-will correspond to units of candelas/meter^2.
-Otherwise, the RGB values should be in spectral watts/steradian/meter^2.
+will correspond to units of candelas/meter^2, unless
+.I \-O
+is specified, when watts/sr/meter^2 are always reported.
 Specifying
 .I \+o
 uses final exposed values, which is the default.
@@ -239,17 +240,19 @@ left to right scanline ordering:
 pvalue \-r \-db \-b \-h +y 400 +x 512 input.im > flipped.hdr
 .br
 pflip \-v flipped.hdr > final.hdr
+.SH NOTES
+Hyperspectral Radiance pictures (.hsr files) are
+converted to approximate RGB.
+However, the colors may not be very accurate.
+Use
+.I rcomb(1)
+for conversion if greater color fidelity is required.
 .SH AUTHOR
 Greg Ward
 .SH BUGS
-The
-.I \-r
-option does not work with the
-.I \-u
-option.
-Also, input pixel locations are ignored during a reverse
+Input pixel locations are ignored during a reverse
 conversion, so this information is not used in determining
 the scanline ordering or picture size.
 .SH "SEE ALSO"
 getinfo(1), pcompos(1), pfilt(1), pflip(1),
-protate(1), ra_xyze(1), rpict(1), rtrace(1), rvu(1)
+protate(1), ra_xyze(1), rcomb(1), rpict(1), rtrace(1), rvu(1)