# colorize.sh [color to change] [new color] [source image] [new image]

PNGA=`mktemp XXXX.png` || exit 1
PNGB=`mktemp XXXX.png` || exit 1

#select color
convert $3 -fuzz 50% -fill white +transparent $1 $PNGA

#convert color to new color
convert $PNGA -colorspace gray $PNGA
convert $PNGA -fill $2 -colorize 50 $PNGA

#compose
convert -composite $3 $PNGA $4
# colorize.sh [color to change] [new color] [source image] [new image]

PNGA=`mktemp XXXX.png` || exit 1
PNGB=`mktemp XXXX.png` || exit 1

#select color
convert $3 -fuzz 50% -fill white +transparent $1 $PNGA

#convert color to new color
convert $PNGA -colorspace gray $PNGA
convert $PNGA -fill $2 -colorize 50 $PNGA

#compose
convert -composite $3 $PNGA $4