#!/bin/sh

set -xe

circle_coordinates="256,256,256"
background_color="white"
foreground_color="black"

convert -size 512x512 \
	"xc:${backgrond_color}" \
	-fill "${foreground_color}" \
	-draw "circle ${circle_coordinates},32" \
	-fill "${background_color}" \
	-draw "circle ${circle_coordinates},96" \
	"${1}.png"

convert "${1}.png" -resize "50%" "${1}-medium.png"
convert "${1}.png" -resize "25%" "${1}-small.png"

convert "${1}-small.png" \
	-level -10%,12% \
	-ordered-dither o8x8 \
	"${1}-dithered.png"