DxOMark Mobile Report
The Nexus 6 is Google's showcase phone for Android 5.0 "Lollipop" and the first Nexus device made by Motorola. It comes with the same dual-LED ring flash as the new Moto X, a 13MP imaging sensor with a fast F2.0 aperture and optical image stabilization. Like the Moto X, the Nexus 6 is capable of recording 4K video. With its 5.96-inch QHD AMOLED screen it is a fairly large device and fully qualifies as a phablet. Under the hood the Nexus 6 is powered by Qualcomm's latest high-end system chip, the Snapdragon S805, and users can choose between versions with 32 or 64GB of storage. Unfortunately, like on previous Nexus models, there is no microSD-slot for memory expansion.
With a DxOMark Mobile score of 78 the Google Nexus 6 easily makes it into the top 10 of the DxOMark smartphone rankings and takes the number six spot, right behind the Sony Xperia Z2 and directly ahead of the Nokia Pureview 808. The DxOMark team reports that the Nexus 6 images are showing "good overall exposure" and that "fine detail in bright light conditions is preserved better than on most smartphones". The testers also noted the "good color rendering" and found that flash images showed "good detail preservation, color rendering and stable exposure". The DxOMark team also liked the "stable and repeatable" autofocus.
On the downside the testers found that "in cloudy conditions the white balance is slightly pink", the autofocus takes a long time to detect a change of scene and that the "uniformity of sharpness across the frame is not as good as most other smartphones."
In the Google Nexus 6's video mode the recorded footage shows "very good texture preservation, good colors and low noise levels." However, the testers found the image stabilization to be inefficient when shooting while walking and noticed rolling shutter artifacts. The AF tends to "overshoot when refocusing".
Color, Exposure and Contrast
The DxOMark team found that the Google Nexus 6 images show "good overall exposure and good color rendering" but "white balance is slightly pink in cloudy conditions" and "in low light (20 Lux) pictures are slightly underexposed compared to most smartphones".
Overall DxOMark awarded the Google Nexus 6 scores of:
- 4.4 out of 5 for Exposure
- 4.0 out of 5 for White Balance accuracy
- 4.2 out of 5 for Color shading in low light*
- 4.4 out of 5 for Color shading in bright light*
- 3.0 out of 5 for Color Rendering in low light
- 4.5 out of 5 for Color Rendering in bright light
*Color Shading is the nasty habit cellphone cameras have of rendering different areas of the frame with different color shifts, resulting in pictures with, for example, pinkish centers and greenish corners.
Noise and Details
DxOMark's engineers reported that on the Google Nexus 6 images show "good detail preservation in bright light" but "in daylight conditions slight luminance noise is noticeable in areas of plain color." Luminance noise is also visible in low light conditions.
Texture acutance is a way of measuring the ability of a camera to capture images that preserve fine details, particularly the kind of low contrast detail (such as fine foliage, hair or fur) that can be blurred away by noise reduction or obliterated by excessive sharpening.
Sharpness is an important part of the quality of an image, but while it's easy to look at an image and decide visually whether it's sharp or not, the objective measurement of sharpness is less straightforward.
An image can be defined as "sharp" if edges are sharp and if fine details are visible. In-camera processing means that it's possible to have one of these (sharp edges) but not the other (fine details). Conventional MTF measurements tell us how sharp an edge is, but have drawbacks when it comes to measuring fine detail preservation. Image processing algorithms can detect edges and enhance their sharpness, but they can also find homogeneous areas and smooth them out to reduce noise.
Texture acutance, on the other hand, can qualify sharpness in terms of preservation of fine details, without being fooled by edge enhancement algorithms.
At first sight, the images from these two cameras may appear equally sharp. A sharpness measurement on edges will indeed confirm this impression, and will even show that the second camera is sharper. But a closer examination of low contrast textures shows that the first camera has better preservation of fine details than the second. The purpose of the texture acutance measurement is to qualify this difference.
Visual noise is a value designed to assess the noise in an image as perceived by the human visual system, depending on the viewing condition (size of image, size of screen or print, viewing distance). The measurements have no units and can be simply viewed as the weighted average of noise standard deviation for each channel in the CIE L*a*b* color space. The lower the measurement, the less noise in the image.
Noise and Detail Perceptual scoring
- Texture (bright light): 4.6 out of 5
- Texture (low light): 3.4 out of 5
- Noise (bright light): 3.8 out of 5
- Noise (low light) 3.2 out of 5
Phone cameras, like entry-level compact cameras, tend to suffer from artifacts such as sharpening halos, color fringing, vignetting (shading) and distortion, which can have an impact on the visual appeal of the end result. DxOMark engineers measure and analyze a range of artifacts. Their findings after testing the Google Nexus 6 are shown below:
- Uniformity of sharpness across the frame not as good as some rivals
- Ringing and fringing noticeable
- Sharpness 3.3 out of 5
- Color fringing 4.0 out of 5
- Ringing center 9.8%
- Ringing corner 5.6%
- Max geometric distortion -0.4%
- Luminance shading 27.3%
Distortion and Chromatic Aberrations
DxOMark also tests autofocus accuracy and reliability by measuring how much the acutance - or sharpness - varies with each shot over a series of 30 exposures (defocusing then using the autofocus for each one). As with other tests these results are dependent on the viewing conditions (a little bit out of focus matters a lot less with a small web image than a full 8MP shot viewed at 100%). Using the 8MP equivalent setting, the Google Nexus 6's AF is very stable and repeatable. The overall score is 85/100 in bright light and 80/100 in low light.
- Stable and repeatable autofocus
- AF slow to detect a change of scene
DxOMark scored the Google Nexus 6 85/100 overall for its flash performance which is one point higher than the iPhone 6 and 6 Plus.
- Good detail preservation, good color rendering and no color shading
- When flash is mixed with low tungsten light white balance turns slightly red but image retains overall pleasant color response
Overall DxOMark Mobile Score for Photo: 81/ 100
DxOMark engineers put phone cameras through a similarly grueling set of video tests, and you can read their full findings on the DxOMark website here. Overall DxOMark found the Google Nexus 6's video performance to be decent, with good textures and color. However, the stabilization is inefficient and causes rolling shutter artifacts.
- Very good texture preservation
- Good color
- Good noise performance.
- Inefficient stabilization, especially for walking movements: only a slight correction of the overall frame translation is noticeable and rolling shutter artifacts are visible.
- Overshoot during refocusing
Overall DxOMark Mobile Score for Video: 74 / 100
DXOMark Image Quality Assessment
With strong photo performance the Google Nexus 6 can compete with the best in class. The DxOMark team reports that its images show good exposure and color, and detail preservation is among the best. The testers also liked the good flash performance and reliable AF behavior. However, the white balance can produce slightly pink results in cloudy conditions and the lens shows some softness towards the edges of the frame.
The Nexus 6 video mode cannot quite keep up with the performance in stills mode. The recorded footage shows very good texture and color with low noise levels but the testers found the image stabilization to be inefficient and to introduce rolling shutter artifacts. For a more detailed analysis, visit www.dxomark.com.
Jan 27, 2015
Oct 15, 2014
Jun 20, 2017
Jun 20, 2017
|Rocks at Dawn by phucthang|
from The Rock
|Sarlat, France by poppyjk|
from Your City - Dinertime!
|Double Eagle by herbymel|
|Great White Egret vs Lizard by jose garcia|
from Strong - Weak
Fujifilm recently unveiled the second in its series of affordable cine lenses, the MK50-135mm T2.9. We got our hands on it for a couple days and took it for a spin.
Leica's first attempt at an M-series digital rangefinder was rough around the edges, but set a pattern for all of the cameras that came after it. In this week's Throwback Thursday, Barney remembers the M8.
No stranger to extreme situations, legendary climber and filmmaker Jimmy Chin talks to Outside Magazine about his career, and the challenge of filming Alex Honnold's rope-free solo climb of El Capitain.
A company backed by Android co-founder Andy Rubin is attempting to make video conferencing less terrible.
Rangefinder magazine asked five professional portrait and wedding photographers about posting on Instagram; no surprise, they got five different answers.
This captivating stop motion film was created by stripping away one layer of wood at a time. It's hard to look away.
It will enable users to simulate the presence of the sun, moon and Milky Way and see how they interact with an area's topography.
Since its introduction in November last year Instagram's live streaming feature has been used by millions, but videos could not be archived for watching at a later stage. A new update has now added the capability.
CopyTrack's study also found that the second most-stolen image is a woman wearing painted jeans. That's apparently a thing.
Forget expensive lenses with fancy coatings and special lens elements – photographer Robin de Puy took these portraits using just a water drop for a lens.
Adobe reports a record quarterly revenue of $1.77 billion for the second quarter fiscal year 2017 ended June 2, 2017.
Zeiss says its new lens is particularly suited for portrait photography but also a good all-rounder and can be used in video applications.
We present to you the top photos from the Kennel Club's 2017 Dog Photographer of the Year photo contest – take a look at 10 of the award-winning puppers.
In case you were looking for any more inspiration to go fly one.
Following a couple of successful Kickstarter campaigns, Videre 35mm's creator has re-tooled the camera with sturdier components and a simpler user assembly process.
The two hour long video covers everything an aspiring drone pilot needs to know.
This is what happens when a Canon 17-85mm F4-5.6 lens meets 60,000 PSI of water pressure. Spoiler Alert: the water jet always wins.
Andrew Harnik discusses the challenges – and rewarding moments – of a career making images for the Associated Press in his native DC.
The VMic Pro, VMic Recorder and VMic microphones are targeted at DSLR users who want to record high-quality audio.
While our full OnePlus 5 review is underway, we've put together a sample gallery with images that were taken with both the wide-angle and tele lens in a variety of lighting situations.
The OnePlus 5 main camera comes with a 1/2.8" 16MP Sony IMX 398 sensor and a fast F1.7 aperture. It is supported by a 2x tele-module featuring a 20MP 1/2.8" Sony IMX 350 sensor and F2.6 aperture.
In this video, Vincent Laforet explains why the RED 8K Weapon camera has mostly replaced his still cameras, and it's not all about resolution.
Dupe, Dupe Negative is not a pop song, and Newton's Rings are not NASA's next destination. If you've ever wondered what all that film terminology means, Kodak has you covered.
Fujifilm's X-A3 is the company's only offering to use a new 24MP sensor without their trademark X-Trans color filter array. We've had it out and about with a variety of lenses to see how it compares.
If you thought Nikon had the market cornered on expensive commemorative products, we've got news for you.
The simple drag-and-drop web app reveals the Lightroom edits applied to any JPEG, along with its associated EXIF data, provided that metadata is intact.
Danish photographers Ulrik Hasemann and Mathias Svold spent time documenting the 75,000 refugees currently in Serbia's capitol city. Most are young men from conflict zones in Pakistan and Afghanistan.
It takes a highly-skilled drone operator to execute a video like this in one take.
According to a report by Nikkei Ricoh is facing its biggest crisis ever and will have to cut costs in order to survive.
Air Koryo started flying in 1952, and much of its current fleet still dates from the 1960s. Danish commercial photographer Arthur Mebius has taken 24 flights on some of its oldest airplanes, so you don't have to.