diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..082a6f8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+test/out
diff --git a/2bit.py b/2bit.py
index 538e249..e3dfe0b 100644
--- a/2bit.py
+++ b/2bit.py
@@ -5,6 +5,10 @@ print_debug = False
 # End of the configuration section
 
 import PIL.Image, sys
+if len(sys.argv) >= 3:
+    outfile = sys.argv[2]
+if len(sys.argv) >= 4:
+    bits = int(sys.argv[3])
 def debug(*args):
     if print_debug: print(*args)
 def binprecision(start, bits, length):
diff --git a/README.md b/README.md
index 2ebcc5f..b3cdc6a 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
 
 Inspired by [2bit](http://2bit.neocities.org/)
 
-Usage: `python3 2bit.py my_image_file.png`
+Usage: `python3 2bit.py infile.png [outfile.png] [bits]`
 
 Warning: Will probably turn transparency black
 
-You can change the number of bits at the top of the file for different results. 1 would be just black and white, while 8 would be the original image in greyscale.
+You can change the number of bits for different results. 1 would be just black and white, while 8 would be the original image in greyscale.
diff --git a/test/run.py b/test/run.py
new file mode 100644
index 0000000..b3a0652
--- /dev/null
+++ b/test/run.py
@@ -0,0 +1,20 @@
+import glob, subprocess, os
+try:
+    import shutil
+    shutil.rmtree("out")
+except:
+    pass
+files = glob.glob("*")
+del files[files.index("run.py")]
+if not os.path.isdir("out"): os.mkdir("out")
+i = 0
+max_i = len(files) * 8
+for f in files:
+    if (os.path.isdir(f)): continue
+    for bits in range(8):
+        bits += 1
+        print(str(int(float(1000*i)/max_i)/10) + "% done")
+        outfilename = "out/" + f.split(".")[:-1] + "-output-" + str(bits) + "bits.png"
+        print("On " + outfilename)
+        subprocess.call(["python3", "../2bit.py", f, outfilename, str(bits)])
+        i += 1
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