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AD Converter
The output from an image chip (CCD) in a digital camera is in the form of an analogue signal. This is converted into digital values by the built in analogue/digital converter in much the same way a MiniDisc or CD recorder would deal with the analogue input from a audio cassette. Ordinary digital cameras use 8-bit analogue-to-digital conversion, which means that each pixel can represent up to 256 different values for brightness. Professional digicams offer 10-bit or even 12-bit conversion,... read more…
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A-DEP
A-DEP - Auto Depth of Field A mode on many Canon EOS cameras. The mode is only available on cameras with multiple focus points and simplifies the process of getting everything between two areas in acceptable focus. Very useful for portrait when you want to make sure all the emphasis is on the face and not the background read more…
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AE
AE Lock - Stands for Auto-Exposure Lock, a function that is generally only found on more expensive cameras. This enables you to take a light meter reading from a particular part of the image and the hold that setting while you compose the image. Useful for dealing with backlighting, and other difficult lighting situations. read more…
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AEB
AEB - Auto Exposure Bracketing read more…
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AF
AF - Auto Focus. Once the shutter is semi depressed the camera will start to automatically focus. Unless a focus lock is used the camera will constantly re focus. AF confirmation mark Mark displayed on the monitor when the subject is in focus. Press the shutter button halfway to focus on the subject . This mark appears when the subject is in... read more…
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AiAF
AiAF - Artificial intelligence Auto Focus. By Canon developed Dual Autofocus System. read more…
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Algorithm
Algorithm A set of processing or working instructions that, because of their high precision, can be carried out independently by a mechanical or electronic device. Algorithms are, for example, the set rules for addition and subtraction etc. However, they are also the instructions that are established in a programming language. Algorithms simply allow the computer to solve particular problems. In image editing, algorithms are used to alter images, e.g. 3-D Cubic Algorithm. read more…
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Aliasing
Aliasing Pixel-shaped curves on the diagonal edges of objects. This can sometimes occur since all graphics consist of individual pixels . Anti-aliasing reduces this unwelcome effect by recalculating the contrast values of the neighbouring pixels and matching them up with each other. read more…
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Aperture
Behind the lens of a camera is a movable circular iris which opens and closes much like the pupil of an eye to control the amount of light falling on the 'CCD'. This is usually controlled by the light meter, although some of the cameras have a manual mode. Altering the aperture also changes the 'depth of field' read more…
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Aperture
Aperture Mechanism behind the lens that controls the amount of light entering the camera. The aperture not only influences picture brightness but also regulates depth of focus . Most cameras are equipped with an iris aperture that can be freely adjusted or set according to pre-selected values. read more…
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