diff --git a/filter.py b/filter.py
index 4150df2..0daff59 100644
--- a/filter.py
+++ b/filter.py
@@ -1,28 +1,60 @@
-from PIL import Image
+import argparse
+import os
 import numpy as np
-img = Image.open("img2.jpg")
-arr = np.array(img)
-a = len(arr)
-a1 = len(arr[1])
-i = 0
-while i < a - 11:
-    j = 0
-    while j < a1 - 11:
-        s = 0
-        for n in range(i, i + 10):
-            for n1 in range(j, j + 10):
-                n1 = arr[n][n1][0]
-                n2 = arr[n][n1][1]
-                n3 = arr[n][n1][2]
-                M = n1 + n2 + n3
-                s += M
-        s = int(s // 100)
-        for n in range(i, i + 10):
-            for n1 in range(j, j + 10):
-                arr[n][n1][0] = int(s // 50) * 50
-                arr[n][n1][1] = int(s // 50) * 50
-                arr[n][n1][2] = int(s // 50) * 50
-        j = j + 10
-    i = i + 10
-res = Image.fromarray(arr)
-res.save('res.jpg')
+from PIL import Image, UnidentifiedImageError
+
+STANDARD_PIXEL_SIZE = 10
+STANDARD_GRAYSCALE = 50
+
+def load_img(path: str):
+    if os.path.isfile(path):
+        try:
+            img = Image.open(path)
+            return np.array(img)
+        except UnidentifiedImageError:
+            print("Incorrect file type.")
+            exit(1)
+    print("This file doesn't exist.")
+    exit(1)
+
+
+def conv_to_gray_pixel_art(img: np.ndarray, pixel_size: int = STANDARD_PIXEL_SIZE,
+                              grayscale: int = STANDARD_GRAYSCALE):
+    for x in range(0, len(img), pixel_size):
+        for y in range(0, len(img[0]), pixel_size):
+            brightness = np.average(img[x: x + pixel_size, y: y + pixel_size])
+            img[x: x + pixel_size, y: y + pixel_size] = brightness - brightness % grayscale
+
+
+    return img
+
+def save_img(img: np.ndarray, filename: str):
+    Image.fromarray(img).save(filename)
+
+
+
+def convert(input_path: str, output_path: str = None, pixel_size: int = STANDARD_PIXEL_SIZE,
+            grayscale: int = STANDARD_GRAYSCALE):
+    img = load_img(input_path)
+    gray_image = conv_to_gray_pixel_art(img, pixel_size, grayscale)
+    file_info = os.path.splitext(input_path)
+    output_path = output_path or f"{file_info[0]}_pixel{file_info[1]}"
+    save_img(gray_image, output_path)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('input_path', type=str, help='Путь до входного изображения.')
+    parser.add_argument('-op', '--output_path', type=str, default=None,
+                        help=('Путь до выходного изображения. Стандартное значение: '
+                              '<путь до файла>_pixel.<расширение файла>.'))
+    parser.add_argument('-ps', '--pixel_size', type=int, default=10,
+                        help=f'Устанавливает размер пикселя. Стандартное значение: {STANDARD_PIXEL_SIZE}.')
+    parser.add_argument('-gs', '--grayscale', type=int, default=50,
+                        help=f'Устанавливает градацию серого. Стандартное значение: {STANDARD_GRAYSCALE}.')
+    args = parser.parse_args()
+    convert(args.input_path, args.output_path, args.pixel_size, args.grayscale)
+
+
+if __name__ == "__main__":
+    main()
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