diff --git a/Makefile b/Makefile
index 5f2bf34..1458427 100644
--- a/Makefile
+++ b/Makefile
@@ -85,7 +85,7 @@ smoke-test: tests/resources/kant_aufklaerung_1784_0020.tif
 	eynollah layout -di $(<D) -o $(TMPDIR) -m $(CURDIR)/models_eynollah
 	test -s $(TMPDIR)/euler_rechenkunst01_1738_0025.xml
 	# binarize:
-	eynollah binarization -m $(CURDIR)/default-2021-03-09 $< $(TMPDIR)/$(<F)
+	eynollah binarization -m $(CURDIR)/default-2021-03-09 -i $< -o $(TMPDIR)/$(<F)
 	test -s $(TMPDIR)/$(<F)
 	@set -x; test "$$(identify -format '%w %h' $<)" = "$$(identify -format '%w %h' $(TMPDIR)/$(<F))"
 	$(RM) -r $(TMPDIR)
diff --git a/src/eynollah/cli.py b/src/eynollah/cli.py
index c189aca..42f9bca 100644
--- a/src/eynollah/cli.py
+++ b/src/eynollah/cli.py
@@ -48,8 +48,7 @@ def machine_based_reading_order(dir_xml, dir_out_modal_image, dir_out_classes, i
 @main.command()
 @click.option('--patches/--no-patches', default=True, help='by enabling this parameter you let the model to see the image in patches.')
 @click.option('--model_dir', '-m', type=click.Path(exists=True, file_okay=False), required=True, help='directory containing models for prediction')
-@click.argument('input_image', required=False)
-@click.argument('output_image', required=False)
+@click.option("--input-image", "-i", help="input image", type=click.Path(exists=True, dir_okay=False))
 @click.option(
     "--dir_in",
     "-di",
@@ -57,16 +56,14 @@ def machine_based_reading_order(dir_xml, dir_out_modal_image, dir_out_classes, i
     type=click.Path(exists=True, file_okay=False),
 )
 @click.option(
-    "--dir_out",
-    "-do",
-    help="directory for output images",
-    type=click.Path(exists=True, file_okay=False),
+    "--output",
+    "-o",
+    help="output image (if using -i) or output image directory (if using -di)",
+    type=click.Path(file_okay=True, dir_okay=True),
 )
-def binarization(patches, model_dir, input_image, output_image, dir_in, dir_out):
-    assert (dir_out is None) == (dir_in is None), "Options -di and -do are mutually dependent"
-    assert (input_image is None) == (output_image is None), "INPUT_IMAGE and OUTPUT_IMAGE are mutually dependent"
-    assert (dir_in is None) != (input_image is None), "Specify either -di and -do options, or INPUT_IMAGE and OUTPUT_IMAGE"
-    SbbBinarizer(model_dir).run(image_path=input_image, use_patches=patches, save=output_image, dir_in=dir_in, dir_out=dir_out)
+def binarization(patches, model_dir, input_image, dir_in, output):
+    assert (dir_in is None) != (input_image is None), "Specify either -di and or -i not both"
+    SbbBinarizer(model_dir).run(image_path=input_image, use_patches=patches, output=output, dir_in=dir_in)
 
 
 
diff --git a/src/eynollah/sbb_binarize.py b/src/eynollah/sbb_binarize.py
index f43b6ba..2d5035f 100644
--- a/src/eynollah/sbb_binarize.py
+++ b/src/eynollah/sbb_binarize.py
@@ -314,8 +314,8 @@ class SbbBinarizer:
             prediction_true = prediction_true.astype(np.uint8)
         return prediction_true[:,:,0]
 
-    def run(self, image=None, image_path=None, save=None, use_patches=False, dir_in=None, dir_out=None):
-        print(dir_in,'dir_in')
+    def run(self, image=None, image_path=None, output=None, use_patches=False, dir_in=None):
+        # print(dir_in,'dir_in')
         if not dir_in:
             if (image is not None and image_path is not None) or \
                 (image is None and image_path is None):
@@ -343,8 +343,8 @@ class SbbBinarizer:
             kernel = np.ones((5, 5), np.uint8)
             img_last[:, :][img_last[:, :] > 0] = 255
             img_last = (img_last[:, :] == 0) * 255
-            if save:
-                cv2.imwrite(save, img_last)
+            if output:
+                cv2.imwrite(output, img_last)
             return img_last
         else:
             ls_imgs  = os.listdir(dir_in)
@@ -374,4 +374,4 @@ class SbbBinarizer:
                 img_last[:, :][img_last[:, :] > 0] = 255
                 img_last = (img_last[:, :] == 0) * 255
                 
-                cv2.imwrite(os.path.join(dir_out,image_stem+'.png'), img_last)
+                cv2.imwrite(os.path.join(output, image_stem + '.png'), img_last)
diff --git a/tests/test_run.py b/tests/test_run.py
index 607140e..b4e2dbd 100644
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -85,8 +85,8 @@ def test_run_eynollah_binarization_filename(tmp_path, subtests, pytestconfig, ca
     outfile = tmp_path.joinpath('kant_aufklaerung_1784_0020.png')
     args = [
         '-m', SBBBIN_MODELS,
-        str(infile),
-        str(outfile),
+        '-i', str(infile),
+        '-o', str(outfile),
     ]
     caplog.set_level(logging.INFO)
     def only_eynollah(logrec):
@@ -117,7 +117,7 @@ def test_run_eynollah_binarization_directory(tmp_path, subtests, pytestconfig, c
     args = [
         '-m', SBBBIN_MODELS,
         '-di', str(indir),
-        '-do', str(outdir),
+        '-o', str(outdir),
     ]
     caplog.set_level(logging.INFO)
     def only_eynollah(logrec):