This repository contains Ultra HDR (JPEG_R) photo samples captured on a Pixel 6 Pro running Android 14 QPR1 Beta 2 with Google Camera version 9.1.098 extracted from a Pixel 8 Pro. The samples are divided into two directories: "Originals" and "SDR Emulation".
"Originals" contains the original photos captured by Mishaal Rahman on his Pixel 6 Pro. "SDR Emulation" contains two variants of each photo from the "Originals" directory. Display analyst Dylan Raga extracted the gain map from the "Originals" images, took the highest pixel value in the gain map (usually 255 = white), reduced the maximum pixel level of the original image to half (128), and added the gain map pixel values to the "_base" images to create the "_hdr" images. The following graphic shows how an HDR gain map can be added to the "_base" SDR image to create the "_hdr" HDR image.
(More of these graphics are available on the accompanying Android Police article.)
The purpose of these modifications is to emulate what an SDR image should look like on an SDR display (as shown on an SDR display) as well as what an HDR image should look like on an HDR display (as shown on an SDR display).
If you are viewing this repository on a device with an HDR-capable display and an operating system/browser that supports Ultra HDR, then you should be able to view the "Originals" (embedded below and found in the "Originals" directory) in HDR. The following devices/OSes/browsers have been tested:
- A Windows 11 PC, with Google Chrome, connected to an LG 42C2
- A 16" M2 MacBook Pro, with Arc
- A Pixel 7 Pro, with Google Chrome, running Android 14
(HDR image support on Android requires the Android 14 OS, a device that supports SDR dimming [eg. Pixel 7 and later], and a recent version of any Chromium-based browser.)
