--- ray/doc/man/man1/pfilt.1	2005/02/16 05:40:06	1.3
+++ ray/doc/man/man1/pfilt.1	2023/12/12 16:31:45	1.7
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: pfilt.1,v 1.3 2005/02/16 05:40:06 greg Exp $"
+.\" RCSid "$Id: pfilt.1,v 1.7 2023/12/12 16:31:45 greg Exp $"
 .TH PFILT 1 11/8/96 RADIANCE
 .SH NAME
 pfilt - filter a RADIANCE picture
@@ -12,7 +12,8 @@ pfilt - filter a RADIANCE picture
 ]
 .SH DESCRIPTION
 .I Pfilt
-performs anti-aliasing and scaling on a RADIANCE picture.
+performs anti-aliasing and scaling on a RADIANCE picture
+or hyperspectral image.
 The program makes two passes on the picture file in order to
 set the exposure to the correct average value.
 If no
@@ -69,7 +70,7 @@ Multiple exposure options have a cumulative effect.
 Color-balance the image as if it were illuminated by fixtures of
 the given type.
 The specification must match a pattern listed in the lamp
-lookup table (see the -f option below).
+lookup table (see the \-f option below).
 .TP
 .BR -f \ lampdat
 Use the specified lamp lookup table rather than the default (lamp.tab).
@@ -105,7 +106,7 @@ of any given output pixel.
 This option may be used to mitigate the problems associated with
 inadequate image sampling, at the expense of a slightly blurred
 image.
-The fraction given should not exceed the output picture dimensions
+The fraction given should not be less than the output picture dimensions
 over the input picture dimensions (x_o*y_o/x_i/y_i), or blurring
 will occur over the entire image.
 This option implies the
@@ -144,5 +145,6 @@ RAYPATH		directories to search for lamp lookup table
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"
-getinfo(1), ies2rad(1), pcompos(1), pflip(1), pinterp(1),
-pvalue(1), protate(1), rad(1), rpict(1), ximage(1)
+getinfo(1), ies2rad(1), pcomb(1), pcompos(1), pflip(1), pinterp(1),
+pvalue(1), protate(1), rad(1), rcomb(1), rmtxop(1),
+rpict(1), ximage(1)