imageSizeInBytes

The size, in bytes, of the image in the repository.

If the image is a manifest list, this will be the max size of all manifests in the list.

Starting with Docker version 1.9, the Docker client compresses image layers before pushing them to a V2 Docker registry. The output of the docker images command shows the uncompressed image size. Therefore, Docker might return a larger image than the image shown in the Amazon Web Services Management Console.