Grey mask

app.py

@@ -91,7 +91,7 @@ def predict(source_img, enlarge_top, enlarge_right, enlarge_bottom, enlarge_left
 
     # Mask
     mask_image = Image.new(mode = input_image.mode, size = (output_width, output_height), color = (255, 255, 255, 0))
-    black_mask = Image.new(mode = input_image.mode, size = (original_width - 20, original_height - 20), color = (0, 0, 0, 0))
+    black_mask = Image.new(mode = input_image.mode, size = (original_width - 20, original_height - 20), color = (127, 127, 127, 0))
     mask_image.paste(black_mask, (enlarge_left + 10, enlarge_top + 10))
     mask_image = mask_image.filter(ImageFilter.BoxBlur(10))