diff --git a/pywal/colors.py b/pywal/colors.py
index 0ede3e1..18a237a 100644
--- a/pywal/colors.py
+++ b/pywal/colors.py
@@ -11,8 +11,9 @@ from . import util
 
 def imagemagick(color_count, img):
     """Call Imagemagick to generate a scheme."""
-    colors = subprocess.Popen(["convert", img, "+dither", "-colors",
-                               str(color_count), "-unique-colors", "txt:-"],
+    colors = subprocess.Popen(["convert", img, "-resize", "25%",
+                               "+dither", "-colors", str(color_count),
+                               "-unique-colors", "txt:-"],
                               stdout=subprocess.PIPE)
 
     return colors.stdout.readlines()