#!/bin/bash
image=$1
convert -resize 128x112 -filter box -quality 100 $image gbtmp-resize-$image
convert -modulate 100,0,100 gbtmp-resize-$image gbtmp-desat-$image
convert -contrast-stretch 20% gbtmp-desat-$image gbtmp-contrast-$image
convert -ordered-dither o8x8,4 gbtmp-contrast-$image gbtmp-dithered-$image
convert -scale 400% -quality 100 gbtmp-dithered-$image gb-$image.png
rm gbtmp-*-$image