# HG changeset patch
# User Peter Meerwald <pmeerw@cosy.sbg.ac.at>
# Date 1209658753 -7200
# Node ID a5249f7d45f71794c89a501462e87744ae057cd1
# Parent  aa7b4c3a731336701e66889dfa70c270e570f7a2
improve cmp_ppm usage help

diff -r aa7b4c3a7313 -r a5249f7d45f7 Meerwald/cmp_ppm.c
--- a/Meerwald/cmp_ppm.c	Thu May 01 18:15:14 2008 +0200
+++ b/Meerwald/cmp_ppm.c	Thu May 01 18:19:13 2008 +0200
@@ -11,6 +11,7 @@
 void usage(void) {
   fprintf(stderr, "usage: %s -c name [-C] [-h] [-m n] [-o file] [-pP] -i file file\n\n", progname);
   fprintf(stderr, "\t-c name\t\tcolor component (default luminance)\n");
+  fprintf(stderr, "\t\t\teg. red, green, blue, luminance\n");
   fprintf(stderr, "\t-C\t\tprint PSNR value only\n");
   fprintf(stderr, "\t-h\t\tprint usage\n");
   fprintf(stderr, "\t-i file\t\toriginal image file\n");