# bumpmap $1 $2 $3 $4 convert $2 with height field $3 to $4
#
# e.g. for hole and hump: 
# bumpmap -70 bg.gif hole.gif ../tile027.gif
# bumpmap  70 bg.gif hole.gif ../tile028.gif
#
convert $2 RGB:$2.rgb
convert $3 RGB:$3.rgb
bumpy $1 $2.rgb $3.rgb $4.rgb
convert -size 16x16 RGB:$4.rgb $4
rm $2.rgb $3.rgb $4.rgb
