Apple used its Surprise and Shine event to announced Apple Reference Image, a feature designed to prove whether a photo taken with the iPhone 18 Pro is authentic. In a context where AI-generated and AI-edited imagery is increasingly hard to distinguish from real captures, Apple is positioning this as a trust tool, saying it is vital for photojournalists and photographers.

When a photo is taken, the main camera sensor captures signed sensor data alongside the image. Apple’s Private Cloud Compute service processes that data into what Apple calls an unalterable image, viewable in the Photos app. The reference image can then be compared against other versions of the photo to determine whether any changes have been made. Apple describes the reference image as a digital negative, a term that signals its intended role as a ground-truth source for later verification.

Initially, reference images are viewable only inside the Photos app, but Apple says it is making APIs available to developers so the feature can be integrated into third-party applications. Apple also confirmed it will support the SynthID standard, which helps people determine whether an image was created or altered with AI. The article does not provide technical details on how the sensor signatures are generated, how the comparison workflow works under the hood, or when the developer APIs will ship.