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The fact that some digital numbers can only take a set of discrete values.
Image format as output by a sensor
Software for transforming sensor image output into an viewable image using, for example, screens and printers.
An image whose pixels contain values corresponding to Red, Green and Blue channels
The property of light reflection on a material (quantity, direction, spectrum…).
The data giving for each wavelength the ratio between the reflected light and the incident light
The fact that a measurement performed in the same conditions will always produce the same results. It is a necessary condition for measurement accuracy although not sufficient.
Reportage includes all forms of photography that tell a story related to people’s lives. Wedding photography, photojournalism, street photography, documentary and war photography all fall into this category. Read more about lens Reportage Score requirements.
From Red, Green, Blue, the typical primaries used in color space, image synthesis or image capture.
The process of capturing a finite number of values from an infinity of values.
The highest attainable gray level on a sensor.
Changing the resolution of an image. Scaling up means increasing the resolution, and scaling down means decreasing. A bi-cubic algorithm can be used to obtain a softer result, by intelligently merging the values of neighboring pixels.
A device that transforms light into a digital signal.
The Sensor Overall Score is an average of the Portrait Score based on Color Depth, the Landscape Score based on Dynamic Range and the Sports Score based on Low-Light ISO. It shows only sensor performance. Read more about Sensor Overall Score.
Characteristic of a sensor that describes its response to light with known wavelength.
Exposure levels corresponding to low gray levels on the sensor.
Sharpness is a subjective quality attribute of an image or a lens. Sharpness indicates the visually perceived quality of details of an image or details reproduced by a lens. It is associated with both resolution and contrast of reproduced details (within an image or by a lens).
The DxOMark score for Sharpness is based on the Perceptual Megapixel (P-Mpix) concept that weights the Modulation Transfer Function (MTF) of the lens with the human visual acuity. Read more about Perceptual Megapixels.
Device or process allowing to start and stop light acquisition on a sensor.
Process that allows exposing the lines of the sensor one after the other.
Mechanical device used to block light from or allow light onto a sensor.
Ratio between the value of a signal and the noise standard deviation.
The data showing the signal-to-noise ratio function of the gray level values.
The data describing the relative amount of light converted into signal for each wavelength
Device used to measure the variation of the energy of incident light as a function of wavelength.
The data relating any arbitrary wavelength to a numerical value.
The expected difference of a signal to its mean value.
The process of decreasing the number of pixels of a digital signal. It is commonly used to display an image on a lower resolution device (screen or print).
A gray level value representing the expected gray level over all possible well exposed photos.
Tonal range is the effective number of distinguishable gray levels a camera can produce.
Target illuminated from behind. Light beams go through the target to reach the camera.
Transmission of a photographic lens describes its ability to transmit light from the photographic scene to the sensor surface. Lenses consists of many glass elements, each reflecting or absorbing a portion of the light; therefore the more elements, the lower the transmission. Read more about how transmission is defined, measured and scored.
Travel & Family photography involves shooting both indoors and out, and includes landscapes, portraits, group shots, and close-ups when sightseeing. The field of view requirement is very broad, from wide-angle to long telephoto, so photographers typically look for a high-power zoom with a good trade-off between all image quality parameters. Read more about lens Travel Score requirements.