import os
import subprocess

icons = os.path.expanduser('~/Downloads/icons');
for img in os.listdir( icons ):
	try:
		out = subprocess.check_output('identify -verbose ~/Downloads/icons/%s | grep "Type: Grayscale"' % (img,), shell=True)
		if(len(out)):
			print(out)
			print('for' + img)
	except subprocess.CalledProcessError:
		pass
		#print('error '+img)