It seems like there might be a bit of confusion with the usage of the PIL (Pillow) library. When working with PIL, the antialiasing is generally used in context of resizing images, not as a filter. The `Image.ANTIALIAS` constant is a resampling filter that you use with the `resize()` method to get a smoother result. The `filter()` method is used for different types of image filters such as blurring or edge enhancement. If you're trying to resize an image with antialiasing, you should use the `resize()` method like this: ```python from PIL import Image img = Image.open('path_to_your_image.jpg') img = img.resize((new_width, new_height), Image.ANTIALIAS) img.save('resized_image.jpg') ``` However, note that in the newer versions of PIL (Pillow), `Image.ANTIALIAS` has been replaced with `Image.Resampling.LANCZOS`. So, using the most recent version of Pillow, you might want to write: ```python from PIL import Image, ImageFilter img = Image.open('path_to_your_image.jpg') img = img.resize((new_width, new_height), Image.Resampling.LANCZOS) img.save('resized_image.jpg') ``` If you actually intended to apply a filter such as a blur or edges enhancement, you would use the `filter()` method with pre-defined filters from `ImageFilter` like this: ```python from PIL import Image, ImageFilter img = Image.open('path_to_your_image.jpg') blurred_image = img.filter(ImageFilter.BLUR) blurred_image.save('blurred_image.jpg') ``` In case you are dealing with an installation issue where the attributes really are missing, it could help to re-install or update the Pillow library. You can do that using pip: ```bash pip install Pillow --upgrade ``` Make sure that you are importing from the PIL library (Pillow, the friendly fork of PIL) and not an outdated version of PIL, which could cause the attributes like `ANTIALIAS` not to be found. Finally, if you need to perform antialiasing in a different context not covered here, please provide additional details about what you're trying to accomplish so that a more specific solution can be given.