Created a script to aid in the creation of new textures for whatever mods

depend on unifieddyes.  Rewrote README and expanded it to document the usage of
that script.

gentextures.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# This line defines the base of the filename, e.g. cotton_xxx_xxx.png
+TEXTURE="cotton"
+
+# This defines the name of the bright red source texture that will
+# be used to generate all of the others.
+base_texture="red_base_"$TEXTURE".png"
+
+base_colors="red orange yellow lime green aqua cyan skyblue blue violet magenta redviolet"
+
+echo -e "\nCurrently configured to generate filenames based on "$TEXTURE"."
+
+if [ ! -e "$base_texture" ] ; then {
+	echo -e "\nPlease supply a proper base texture from which to generate all"
+	echo "of the colors.  It must be named "$base_texture" and must"
+	echo -e "be placed in the directory you ran this script from.\n"
+	exit 1
+} fi
+
+pushd . >/dev/null
+mkdir generated-textures
+cd generated-textures
+
+hue=0
+for name in $base_colors ; do
+	hue2=`echo "scale=10; ("$hue"*200/360)+100" |bc`
+	echo $name "("$hue" degrees)"
+	echo "     dark"
+	convert ../$base_texture -modulate  33,100,$hue2 $TEXTURE"_dark_"$name".png"
+	echo "     medium"
+	convert ../$base_texture -modulate  66,100,$hue2 $TEXTURE"_medium_"$name".png"
+	echo "     bright"
+	convert ../$base_texture -modulate 100,100,$hue2 $TEXTURE"_"$name".png"
+	echo "     dark, 50% saturation"
+	convert ../$base_texture -modulate  33,50,$hue2  $TEXTURE"_dark_"$name"_s50.png"
+	echo "     medium, 50% saturation"
+	convert ../$base_texture -modulate  66,50,$hue2  $TEXTURE"_medium_"$name"_s50.png"
+	echo "     bright, 50% saturation"
+	convert ../$base_texture -modulate 100,50,$hue2  $TEXTURE"_"$name"_s50.png"
+	hue=$((hue+30))
+done
+
+echo "greyscales"
+echo "     black"
+convert ../$base_texture -modulate  15,0,0  $TEXTURE"_black.png"
+echo "     dark grey"
+convert ../$base_texture -modulate  50,0,0  $TEXTURE"_darkgrey.png"
+echo "     medium grey"
+convert ../$base_texture -modulate 100,0,0  $TEXTURE"_mediumgrey.png"
+echo "     light grey"
+convert ../$base_texture -modulate 150,0,0  $TEXTURE"_lightgrey.png"
+echo "     white"
+convert ../$base_texture -modulate 190,0,0  $TEXTURE"_white.png"
+
+popd >/dev/null