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Apple's new iPhone 15 is an underwhelming 'slap in the face,' say disappointed fans
(www.businessinsider.com)
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The iPhone's portrait mode uses actual depth information captured from the separate depth sensor. The new feature is that it will always capture the depth information for every picture you take so that at a later point you can use it to blur parts of the image at different depths. Google's version of portrait mode just uses image recognition to detect what's in the background. It does a good job, but not as good as if it had actual depth information.