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As we expected, raw-capable phones clearly stood above the rest in this test. Thats because jpeg compression usually involves raising contrast, which irreversibly destroys dynamic range in both highlights and shadows. Raw photos preserve all the data that the image sensor captures, which is clearly visible in the samples from the lg g4 (above). The first shot is a carefully edited raw with lots of rescued highlight detail, while the second—an unedited jpeg taken at the same time—is a shot id have tossed out immediately.
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in the raw-capable group, the best performer was the cm1, with a respectable 11. 7 stops of range—on par with some entry-level dslrs. The next best was the lg g4, with 10. 7 stops, followed by the htc one m9 (9. 7 stops) and nexus 6 (8. 77 stops, noise-limited). In the jpeg division, the iphone preserved more range than the s6 edge, but without raw its impossible to know how their sensors truly compare.
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when you want to take a picture with a smartphone in dim light, you really only have two options: use a tripod and a slow shutter speed, or crank up the iso sensitivity. Bumping the iso is usually more convenient, but it also amplifies everything the camera is capturing—including image noise.
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This either gives you grainy pictures or, thanks to automatic noise reduction, muddy-looking details.
to test how cameras perform in low light, we analyzed shots taken at iso 800 and 1600 (when available). We looked at two key metrics: quantity of image noise and effect of noise reduction.
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Noise is easy to quantify, but noise reduction is trickier.
to nail it down, we use a custom spilled coins chart that, well. Looks like a bunch of multicolored coins scattered on a table.
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When cameras apply noise reduction to images of the spilled coins chart, it lowers the acutance (or perceived sharpness) of the image, which is something we can quantify.
you can see the effect in the first set of samples above, which shows full-size crops from each smartphone taken at iso 800 (with the nikon d610 full-frame dslr as a control sample). The effects of noise reduction are even more obvious at iso 1600 (below). the best overall performer was the panasonic cm1, which produced both low noise and minimal noise reduction at iso 800 and 1600. In the non-cm1 division, the samsung galaxy s6 edge won out thanks to its intelligent noise reduction algorithm.
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The shots display clear signs of noise reduction when viewed at 100%, but details hold up better than in shots from other phones. The lg g4 also does well, mostly because it has a light touch, leaving most of the noise (and thus fine detail) alone.
the next best result came from the iphone 6, which takes full advantage of its 8-megapixel camera and larger individual pixels.
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But the advantage is something of an illusion.
When we downsample all the iso 800 shots to match the iphones 8 megapixels (below), apples advantage quickly disappears. the beauty of smartphones is that, in many cases, you can add the features you want by simply downloading an app. Whether youre running android or ios, you have countless options, and there are new apps to try every day. But even taking this into account, not all phones (or mobile oses) are equal.
for example, android 5. 0 lollipop supports raw capture with the updated camera2 api, but not all phones have adopted it. The nexus 6 has, as has the lg g4. The lg puts its raw capability to excellent use in the brands default camera app, which is also the only app that can take advantage of the phones laser-assisted autofocus. the sony xperia z3 compact and samsung galaxy s6 edge also run lollipop, but neither offers raw capture—even in apps that would otherwise support it. This is a conscious choice by the manufacturers, and a puzzling one. Sure, most people are never going to shoot raw, but most people arent going to insert augmented reality elves into their shots either, and that sure didnt stop sony. the iphone 6s stock camera app trades fine-grained manual control for a simple, intuitive user interface.
Still, apple allows third-party apps more control over things like iso sensitivity, letting intermediate and advanced photographers find an app that suits their needs.
the panasonic lumix cm1 offers more control than any other phone in our test group, but it has to work around androids limitations to support its custom hardware.
The result is a hit-or-miss experience with third-party apps, but the workarounds also have their upsides.
Most notably, the cm1 properly indexes raw files. So when you hit upload images in dropbox, the . dngs will appear like any other image. With other android phones—even those that claim to support raw—these files are hidden and you can only be found by manually digging through all files.
as important as still image quality is to any camera, we cant overlook the importance of video.
Sometimes a video is the best (and easiest) way to capture a fleeting moment, and with 4k uhd video on the rise, theres bound to be more attention paid to smartphones cameras that can keep pace with the times.
in most ways, the qualities that make a camera good at shooting still photos carry over to video, as well. There are other factors at play, of course, but accurate color, reliable white balance, and wide dynamic range pay dividends in both stills and video.
Its no surprise, then, that our top smartphones for video look a lot like our top phones for stills.
just as you want crisp, clear results when shooting photos, you want the highest resolution possible when capturing video. The highest resolution you can get today is 4k uhd. Remember how lifelike 1080p hd looked when you first upgraded from a standard-def tv set? A good 4k recording will give you the same eye-popping effect, offering four times as many pixels as 1080p.
most of our test phones are capable of recording usable 4k uhd video, with only the panasonic cm1 and the iphone 6 limited to 1080p. (The cm1 records 4k, but its only at 15fps.
) the 4k phones performed well in our bright-light video sharpness test, all recording around twice as much detail (above) as the 1080p-limited phones like the cm1 (below). this result matches up precisely with what weve seen from all of our reviewed cameras in the past couple years.
With four times as many pixels per frame, 4k uhd video simply resolves more detail than even the best hd cameras ever could. Theres no arguing with the math.