JPEG= $(wildcard *.jpeg)
IMG= $(wildcard *.jpg)
COVER= cover.jpg

.PHONY: convert

setup:
	sudo apt install imagemagick
	tlmgr install cd-cover

convert:
	mogrify -format jpg $(JPEG)

cover: convert
	mogrify -gravity Center -crop 1089x1089+0+0 $(IMG) -trim
	montage -geometry 1089x1089 -tile 3x3 $(IMG) $(COVER)
	mogrify -colorspace Gray $(COVER)
	mogrify -resize 50% $(COVER)