convert tmp/mkgrid.1007.croppx.gif -fill black -draw "line 0,0 0,737" -draw "line 50,0 50,737" -draw "line 100,0 100,737" -draw "line 150,0 150,737" -draw "line 200,0 200,737" -draw "line 250,0 250,737" -draw "line 300,0 300,737" -draw "line 350,0 350,737" -draw "line 400,0 400,737" -draw "line 450,0 450,737" -draw "line 500,0 500,737" -draw "line 0,0 523,0" -draw "line 0,50 523,50" -draw "line 0,100 523,100" -draw "line 0,150 523,150" -draw "line 0,200 523,200" -draw "line 0,250 523,250" -draw "line 0,300 523,300" -draw "line 0,350 523,350" -draw "line 0,400 523,400" -draw "line 0,450 523,450" -draw "line 0,500 523,500" -draw "line 0,550 523,550" -draw "line 0,600 523,600" -draw "line 0,650 523,650" -draw "line 0,700 523,700" mkgrid.jpg