MARGIN_X=30
MARGIN_Y=206
SIZE_X=426
SIZE_Y=70

SEQ=3

all: matita.xcf
	for Y in `seq 0 $(SEQ)`; do \
		convert matita.png -crop \
			$(SIZE_X)x$(SIZE_Y)+$(MARGIN_X)+`expr $(MARGIN_Y) + $$Y '*' '(' $(SIZE_Y) + 1 ')'` tmp.png; \
		composite -compose src-over bg.png tmp.png bg$$Y.png;\
	done;\
	rm tmp.png		

clean:
	for X in `seq 0 $(SEQ)`; do\
		rm bg$$X.png;\
	done