New Post: FileSize zero after Blur and ReduceNoise

Doing some discovery work. Querying FileSize for an image, receiving expected size. Then calling Blur (or ReduceNoise) for the image, and again query FileSize. Always receiving zero for FileSize after the Blur or ReduceNoise. Expected?

How can I query for the file size to get the current size of the image after the action?

Thank you.