DxOMark is a website providing image quality ratings for standalone cameras, lenses, and mobile devices that include cameras, particularly smartphones. It is owned by DxOMark Image Labs, headquartered in Boulogne-Billancourt, France. DxOMark Image Labs was spun off from DxO Labs in September, 2017.
Camera sensor rating
The DxOMark Camera Sensor Score measures several important image quality metrics of the RAW image captured by a camera's sensor. The overall score is a confidential combination of three sub-scores:
- Color Depth, measured in bits, called a Portrait score
- Dynamic Range, measured in stops of dynamic range, called a Landscape score
- Low-light performance, measured in an ISO equivalent, called a Sports score
Another metric, the Perceptual MegaPixel (P-MPix) is used to rate the resolution a camera produces when paired to a particular lens. DxOMark claims that P-MPix is a more accurate and relevant value for photographers to consider than alternate measures of sharpness when evaluating camera and lens image quality. As of December 2015, the Canon EF 300mm f/2.8L IS II USM lens mounted on a Canon EOS 5DS R have the highest measured P-MPix (45 P-Mpix) followed by the Carl Zeiss APO Sonnar T* 2/135 ZE (41 P-Mpix on Canon EOS 5DS R and 36 P-Mpix on Nikon D800E).
DxOMark data has been used to plot the progress of sensor image quality and low-light sensitivity versus price over the years, as well as the impact of sensor size and resolution. More recently, DxOMark has also evaluated drone cameras for image quality.
As smartphones began to overtake point-and-shoot cameras, DxOMark began testing smartphones and other mobile devices in 2011 and introduced DxOMark Mobile in 2012. A major update was made in September 2017, adding tests designed to stress the capabilities of current-model smartphones such as lower-light shooting, telephoto zoom, depth effect, and bokeh.
DxOMark Mobile Overall Score is the headline number reported for each tested device, and consists of a proprietary combination of DxOMark Mobile Photo and DxOMark Mobile Video category scores.
DxOMark's Mobile Photo score is a proprietary combination of nine category sub-scores:
- Exposure and contrast
DxOMark's Mobile Video score includes six of the same Sub-scores as DxOMark's Mobile Photo score (Exposure, Color, Autofocus, Texture, Noise, and Artifacts), along with Stabilization.
DxOMark's tests are conducted by the company's technical staff under a variety of lighting conditions, ranging from low-light 1 Lux to bright daylight outdoors.
Sub-scores are combined using a proprietary and confidential mapping into an overall score. Tests are also confined to default modes, except for Zoom and Bokeh, which has caused reviewers to be cautious when using them.
As of 22 January 2019, DXOMark has started testing the front-facing (selfie) cameras on smartphones. Selfie tests are done for both Photo and Video. For Photo there are sub-scores for Exposure, Color, Focus, Texture, Noise, Artifacts, Flash, and Bokeh. For Video, sub-scores include Exposure, Color, Focus, Texture, Noise, Artifacts, and Stabilization.
Usage in industry
DxOMark ratings are often used by the press to describe the image quality characteristics of their cameras and mobile devices. High DxOMark Mobile ratings have also been featured as hallmarks of quality in vendor announcements and marketing materials, although reviewers are careful to note that the ratings only reflect image quality. DxOMark also provides consulting services to hardware manufacturers, related to image quality.
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