Developer B-S-G has modified the Google Camera application so that all Android smartphones with Snapdragon 820, 821 and 835 processors are also equipped with HDR + feature.
Snapshot images Galaxy S8 or OnePlus 3 will get better especially when used to take photos in places that are too bright or with dark shadows.
XDA has confirmed this, so this is not a mere gimmick. According to The Verge, an XDA writer, Adam Conway reported, he has tested this application on various smartphones and found that the quality of the resulting image is indeed increasing. Some of the smartphones he tried include LG G6, OnePlus 3, OnePlus 3T, OnePlus 5 and Samsung Galaxy S8.
XDA also tries to ensure that there is no malware in this application and claims that the application is safe to download. However, this software is still not perfect. Therefore, you may not want to try it out if you rely on Google Camera to take photos.
Chances are, this software will not live long, considering he did not get approval from Google.