--- a/tools/gfxconv.c	Fri Oct 26 09:56:25 2018 +0300
+++ b/tools/gfxconv.c	Thu Nov 08 11:42:23 2018 +0200
@@ -146,7 +146,7 @@
     {  5, 'f', "format",        "Set output format (spr[:mc|sc], chr[:mc|sc] or any supported image or C64 bitmap format, see --formats)", OPT_ARGREQ },
     { 17, 'F', "formats",       "List supported input/output formats", OPT_NONE },
     {  8, 'q', "sequential",    "Output sequential files (image output only)", OPT_NONE },
-    {  6, 'c', "colormap",      "Set color mapping (see below for information)", OPT_ARGREQ },
+    {  6, 'm', "colormap",      "Set color index mapping (see below for information)", OPT_ARGREQ },
     {  7, 'n', "numitems",      "How many 'items' to output (default: all)", OPT_ARGREQ },
     { 11, 'w', "width",         "Item width (number of items per row, min 1)", OPT_ARGREQ },
     {  9, 'S', "scale",         "Scale output image by <n>, <x>:<y>, <x>:<y>*<n> integer factor(s). "
@@ -230,12 +230,12 @@
     "unused colors from the palette. This is not usually desirable, for example\n"
     "when converting multiple images to same palette.\n"
     "\n"
-    "Color mapping (-c)\n"
-    "------------------\n"
+    "Color index mapping (-m)\n"
+    "------------------------\n"
     "Color mapping definitions are used for ANSI and image output, to declare what\n"
     "output colors of the C64 palette are used for each single color/multi color\n"
     "bit-combination. For example, if the input is multi color sprite or char,\n"
-    "you can define colors like: -c 0,8,3,15 .. for single color: -c 0,1\n"
+    "you can define colors like: -m 0,8,3,15 .. for single color: -m 0,1\n"
     "The numbers are palette indexes, and the order is for bit(pair)-values\n"
     "00, 01, 10, 11 (multi color) and 0, 1 (single color). NOTICE! 255 is the\n"
     "special transparency color index.\n"