--- ray/doc/man/man1/pcomb.1	2003/04/07 15:43:08	1.2
+++ ray/doc/man/man1/pcomb.1	2006/09/08 21:38:25	1.7
@@ -1,10 +1,12 @@
-.\" RCSid "$Id"
+.\" RCSid "$Id: pcomb.1,v 1.7 2006/09/08 21:38:25 greg Exp $"
 .TH PCOMB 1 8/31/96 RADIANCE
 .SH NAME
 pcomb - combine RADIANCE pictures
 .SH SYNOPSIS
 .B pcomb
 [
+.B -h
+][
 .B -w
 ][
 .B "\-x xres"
@@ -68,7 +70,7 @@ For example,
 would return the red component of the pixel from picture 3
 that is left 2 and up 1 from the current position.
 Although x offsets may be as large as width of the picture,
-y offsets are limited to a small window (+/- 8 pixels) due to efficiency
+y offsets are limited to a small window (+/- 32 pixels) due to efficiency
 considerations.
 However, it is not usually necessary to worry about this problem --
 if the requested offset is not available, the next best pixel is
@@ -85,7 +87,11 @@ The constant
 gives the number of input files present,
 and
 .I WE
-gives the white efficacy (lumens/brightness) for pixel values.
+gives the white efficacy (lumens/brightness) for pixel values,
+which may be used with the
+.I \-o
+option or the le(n) values to convert to absolute
+photometric units (see below).
 The variables
 .I x
 and
@@ -136,6 +142,13 @@ will return a negative value, and
 will return zero.
 .PP
 The
+.I \-h
+option may be used to reduce the information header size, which
+can grow disproportionately after multiple runs of
+.I pcomb
+and/or
+.I pcompos(1).
+The
 .I \-w
 option can be used to suppress warning messages about invalid
 calculations.
@@ -205,4 +218,4 @@ pcomb -x 100 -y 100 -e 'ro=b;go=b;bo=b;b=if((x-50)^2+(
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"
-calc(1), getinfo(1), pcompos(1), pfilt(1), rpict(1)
+getinfo(1), icalc(1), pcompos(1), pfilt(1), rpict(1)