Today I went into a little digging to analyze some Samsung Galaxy S8 sample images and see how well it copes in low-light situations. of course I expect it to perform well, but nevertheless, a felt that I won't count on the S7 performance and see for myself how good the image quality is in low-light situations. The thing is that many phone review's websites don't do extensive tests to analyze the high ISO performance in-depth. As for now, I usually judge the image quality based on my own sample image analysis and DxOMark tests. I think that DxOMark just made all the other camera reviews obsolete, just because their phone camera reviews are so extensive and reliable. As of the time of writing, DxOMark didn't do any review on the S8 rear-facing camera, so I was left only with the option to evaluate it myself.
So let's go over some low light sample images and see how the S8 performs under more restricting low-light conditions I will link to each camera sample image I analyze, so you can view and and judge it by yourself.
The first set of images can be seen here on lowyat.net website. By the way, I checked the EXIF data just to be sure that it was taken with the Galaxy S8, and the Model name is SM-G950F, which is the Galaxy S8 model and the aperture of f/1.7 also verifies that this is indeed sample images taken with the S8. The Website itself is also a reliable website. OK, let's talk about those images.
The S8 low-light images seems a bit darker compared to the S7. I've already heard that the S8 has a different sensor than the S7. I don't know if this is 100% correct, but sources posted about it lead me to believe that it does have a new sensor. A new sensor suppose to be a batter once, considering that it has the same resolution and aperture size. The images does appear slightly darker for some reason. I don't know whether it's because of the different light metering reading or because of the lower dynamic range. But by default, it seems that the S7 edge captures a brighter image.
The low-light street images with the "The Phantom of the Opera" sign looks pretty good. It was taken at ISO 250 at 1/17 sec shutter speed. This shows that the S8 is capable of capturing sharp and well-exposed pictures in at night where there is a good amount of ambient light around, and the OIS does a very good job in making sure that the images is sharp and clear. 1/17 sec shutter speed is definitely lower than the recommended one based on the shutter speed rule of thumb (1/focal length), yet the result are very convincing.
There is image noise in the photo, but it's mostly available in the dark parts of the image, like in the dark black sky. I am viewing the image at 100% scale, but if you resize it a bit, you won't be able to notice the noise at all. Shooting in a cloudy day isn't a problem for the S8. By the way, I checked these sample images taken by phonearena.com that compared the S8 vs S7, iPhon e7 and LG G6, and the S8 turned out brighter than the S7. There might be not difference between the two, as the images taken in a slightly difference time judging by the clouds in the image, so the exposure might be different. This is why you need to test these things in closed an supervised lab tests to really check how the two cameras differ.
There are plenty of more images here, which can give you a good understanding what the S8 primary camera is capable of when shooting in un-optimal lighting conditions. As long as there is a good source of ambient light around from street lamps or bright street signs, you can get very good and well exposed images, but when those drop, it's harder for the camera to produce good low-light shots. Now don't get me wrong, the Galaxy S8 camera is suitable for probably 99% of the time. It's rarely that we shoot in pitch black scenes or in areas where there is very little artificial light source around us.
The low-light performance is excellent due to the F1.7 aperture, the effective OIS, large 1.4 micron pixels, a modern sensor and the advanced image processing. All that leads to some incredible shots, which are sharp, bright and boast superb color definition. Just look at all those images, the dynamic range isn't even too much affected and the pictures still maintain great colors and high contrast.
So overall, I think that if you plan to be the S8, you can rest assured that the S8 won't disappoint when it comes to low-light performance-it boasts a praiseworthy low-light performance in my personal opinion. It isn't a magic camera and obviously it can't compete against a large-sensor DSLR with a f/1.8 lens in low-light, but for a mobile phone, the low light performance is admirable. By the way, beware of many fake camera sample and video samples out there, there are tons of them which weren't taken by the real phone. Search for reliable websites and other online sources that you know you can trust. Don't base your buying decision on false information. I try to do my best to not fall into the trap by checking the sites popularity and EXIF data whenever I can. Cheers.