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#!/usr/bin/bash | |
echo "processing $1 and $2" | |
PNG0=$1 ## png0 <----- first image should be the BLACKEST | |
PNG1=$2 ## png1 <----- second image should be the WHITEST | |
#PNG2=$3 ## png2 <----- third - todo - this could be an opaque fg with tranparent bg | |
bg_size=`identify -format '%wx%h' "$1"` | |
#echo "bg is $bg_size" | |
magick convert $PNG1 -resize $bg_size $PNG1 | |
magick convert $PNG0 -channel RGBA -matte -colorspace gray -normalize -ordered-dither o8x8 gray_$PNG0 | |
magick convert $PNG1 -channel RGBA -matte -colorspace gray -normalize -ordered-dither o8x8 gray_$PNG1 |