diff --git a/img2irc.py b/img2irc.py
index 93a9ca3..36cb987 100644
--- a/img2irc.py
+++ b/img2irc.py
@@ -45,13 +45,17 @@ palettes = {
 			  0xbcbcbc, 0xe2e2e2, 0xffffff]
 }
 
-def convert(data, max_line_len, img_width=80, palette='RGB99', enhance=False):
+def convert(data, max_line_len, img_width=80, palette='RGB99', enhance=False, effect=None):
 	if palette not in palettes:
 		raise Exception('invalid palette option')
 	palette = palettes[palette]
 	image = Image.open(io.BytesIO(data))
 	if enhance:
 		image = ImageEnhance.Contrast(image)
+	if effect == 'grey':
+		image = image.convert("L")
+	elif effect == 'black':
+		image = image.convert("1")
 	del data
 	return convert_image(image, max_line_len, img_width, palette)