Two cool new features of the Pixel 4 camera will not be ported back to older Pixel phones Ė Live HDR+ and Dual Exposure Controls. Those can only run on the new hardware, so the Pixel 3, 3a and others are out of luck.
To be fair, few phones are fast enough to do real-time HDR preview. The Pixel 4 and 4 XL technically arenít either, what you see on their viewfinders is an approximation of the final result. The effects of the Dual Exposure sliders are previewed in real time so they arenít supported on older models either.
Google is throwing the Pixel 3 and 3a a bone, however Ė the astrography mode called Night Sight will be backported to older models. It can snap up to fifteen exposures, each 16s long, correct for the motion of the stars and the swaying of the trees and output an impressive shot of a starry sky.
But obviously thereís no real-time component here. Chances are that the live preview duties are handled by the new Pixel Neural Core and canít run on the old Pixel Visual Core.
The paper real-time hdr is based upon (http://dx.doi.org/10.1145/3072959.3073592) is from 2017 and says that the method was used with a smartphone GPU and took about 2ms to generate (@1080p). A dsp would be even faster.
people this feature is missing on your phone because old pixels has 1 camera and this task is being accomplished surely while using the 2 cams so they can get different exposures only 2+ camera phones with snapdragon 855 will be the key to know if t...