Update apply_mask.py

apply_mask.py

@@ -68,7 +68,7 @@ def apply_mask_and_crop(input_folder, mask, output_folder):
         
         # Save cropped image
         cv2.imwrite(output_path, cropped_img)
-        if i = 0:
+        if i == 0:
             preview_path = os.path.join(output_folder, f"preview_{filename}")
             cv2.imwrite(preview_path, cropped_img)
             return preview_path