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840 terms · page 6 of 35
Checksum Verification
Computing a mathematical fingerprint of a file and comparing it later to confirm the data has not changed.
Colour & Colour ManagementChroma
The colourfulness of an area judged relative to the brightness of a similarly lit white, a perceptually defined counterpart to saturation.
Files, Metadata & WorkflowChroma Subsampling
A compression technique that records colour information at lower resolution than brightness information.
Post-Processing & RetouchingChromatic Aberration Removal
Processing that eliminates coloured fringing along high-contrast edges by realigning or desaturating the offending channels.
Colour & Colour ManagementChromatic Adaptation
The visual system's automatic adjustment to the colour of the prevailing light, which keeps familiar objects looking the same colour under…
Film, Darkroom & Historic ProcessesChromogenic Black and White Film
A monochrome film that forms its image from dye couplers rather than silver, and is processed in standard colour chemistry.
Printing, Display & OutputChromogenic Print
A print made on light-sensitive photographic paper and developed in chemistry, whether exposed from a negative or by a digital light source.
Colour & Colour ManagementCIE Chromaticity Diagram
The horseshoe-shaped plot of all colours visible to human vision, on which colour space gamuts are drawn as triangles.
Colour & Colour ManagementCIELAB
A device-independent colour model with one lightness axis and two opponent colour axes, designed so equal numerical steps look equally…
Motion, Video & Creative TechniquesCinemagraph
A still image in which a small isolated area moves in a seamless loop.
Focus & Depth of FieldCircle of Confusion
The largest blur circle that still reads as a point to the viewer, and the value on which every depth-of-field calculation depends.
Optics, Lenses & FiltersCircular Polarising Filter
A rotating filter that blocks polarised light, cutting reflections from non-metallic surfaces and deepening blue skies.
Lighting & FlashClamshell Lighting
A beauty setup with one soft source above the face and a reflector or second source directly below, both facing the subject.
Post-Processing & RetouchingClarity
A midtone local-contrast control that adds apparent punch and definition without affecting the extreme tones.
Exposure & MeteringClipping
The loss of tonal information when values are pushed past the maximum or minimum a file can encode.
Post-Processing & RetouchingClipping Mask
A layer restricted so that it only affects the single layer directly beneath it, using that layer's shape as its boundary.
Post-Processing & RetouchingClone Stamp
A retouching tool that copies pixels from one part of an image directly onto another.
Optics, Lenses & FiltersClose-up Diopter
A magnifying filter that screws onto the front of a lens to allow closer focusing without losing light.
Files, Metadata & WorkflowCloud Backup
Storing a copy of image files on remote servers accessed over the internet.
Sensors & Digital CaptureCMOS Sensor
A sensor type in which each photosite has its own amplifier and the charge is converted to voltage at the pixel itself.
Printing, Display & OutputCMYK
The subtractive four-ink model — cyan, magenta, yellow and black — used in commercial printing.
Motion, Video & Creative TechniquesCodec
The compression scheme used to encode and decode video data.
Files, Metadata & WorkflowCollection
A named grouping of images assembled for a purpose, independent of where the files are stored.
Colour & Colour ManagementColorimeter
An instrument that measures colour through three filters approximating human vision, used mainly for calibrating displays.