Android 14 adds support for Ultra HDR, a new type of JPEG file (JPEG_R) that can include a gainmap in its metadata so that the HDR version of an image can be rendered on HDR displays and the SDR version on SDR displays.
Separately, Android 14 also adds APIs that lets 3P apps like Chrome support HDR images. Chrome now not only supports these kind of relative HDR containers (like Google's Ultra HDR or Apple's EDR) but also absolute HDR containers (like 10-bit AVIF).
The result is stunning!
Thanks to Dylan Raga for his help in editing these images so you can see what it looks like on SDR displays.
Here are the websites that had those photos: https://gregbenzphotography.com/hdr/
https://ccameron-chromium.github.io/hdr-jpeg/
Here's the commit adding HDR image support in Chrome on Android 14: https://source.chromium.org/chromium/chromium/src/+/127fc8e18e96578c510e6269f013d9f4e28f8ab5
The issue tracker report: https://bugs.chromium.org/p/chromium/issues/detail?id=1430768
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The APIs that were added in Android 14 that make this possible include android.view.Display#getHdrSdrRatio, android.view.Display#registerHdrSdrRatioChangedListener, and android.view.SurfaceControlTransaction#setExtendedRangeBrightness(...)
Lastly, I should note that you'll need a device that supports SDR dimming on Android 14 for this to work. That currently includes the Pixel 7 and newer.
This article explains what SDR dimming is: https://esper.io/blog/android-sdr-dimming
Mishaal Rahman