# revision The feature extractor revision number. ``` var revision: Int { get set } ``` ## Discussion There are two Image Feature Print revisions: 1 and 2. In most cases revision 2 produces better models because it uses a smaller feature vector and better features. In iOS 12 or later, tvOS 12 or later, and macOS 10.14 or later, revision 1 takes images with a size of 299x299 and produces a 2048 feature vector. In iOS 17 or later, tvOS 17 or later, and macOS 14 or later, revision 2 takes images with a size of 360x360 and produces a 768 feature vector. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)