Digital Photography Jargon

Is digital camera tech-talk making you crazed ?
New technology can initially seem somewhat daunting, but fear not – help is at hand.

AE Lock: : Stands for Auto-Exposure Lock ,this enables you to take a light meter reading from a part of the frame, then hold that setting while you compose the image

Aperture: Behind the lens is a movable circular iris that opens and closes to determine the amount of light you want falling on the sensor (CCD/CMOS) .Altering the aperture will also change the depth of field.

Aperture priority: A semi-manual exposure option. The user sets the aperture according to the depth of field they require., and the metering system sets the shutter speed to obtain the correct exposure.

Artefacts: When an image is stored in a digital camera’s memory. it has to compressed to fit. When this happens, any noise that creeps in will appear as angular locks, which are known as artefacts

Backlighting: Backlighting occurs when your subject is brightly lit from behing, makin it difficult to set the corret exposure. Unless you adjust the camera’s exposure to conpesate, your subject will appear as a dark silhouette against the bright background.

Barrel Distortion: Image that appears spherized caused by the camera wide angle lens.

Bit Depth: This is the number of bits you have in which describe the color of photo. The more bits the more accurate the image will be.

Buffer: This is digicam RAM (Random Access Memory) that can store images before the’re written to memory card. This enables to shoot severral photos without waiting for each to be saved.

CCD: Charge Coupled Device. This is a light sensor in a camera that essentially records the image you take as a photograph. It consists of millions of tingy light sensors, one for each pixel. The size of CCD is measured in megapixels, and the more thera of these, the better

Center Weighted Metering: This is when the camera takes a light rreading from the whole frame, but it pays attention to the center of the image

CMOS: Complimentary Metal-Oxide Semiconductor, a light sensor that offers higher resolution at a fraction of the cost.

Depth of Field: When you focus your digicam on a subject, some detail behind and in front will also be in focus. The distance between the nearest and furthest in-focus objects is known as the depth of field. This is changed by altering the aperture. The larger the aperture, the smaller depth of field.

Digital Zoom: some digicams can zoom in on the centre of an image by expanding it in the camera. The zoomed area looks bigger but contains the same number of pixel. So it will lok block. Not to be confused with optica zoom, whis is far superior.

DPI: Stands for Dots Per Inch. The quality of a pronter is defined by how man dots of ink per inch it kan produce.

Dynamic Range: the difference between the brightest and darkest parts of an image. If a shot has very bright highlights, dark shadows and everything else in between, it is said to have a wide dynamic range.

Effective Pixel: A digicam may claim to have 3.34 megapixels CCD, but not all of them are used for taking the picture. Some are painted in black for color balance, while others fall outside the range of the lens.

EV: Short for Exposure Value, the amount of shutter speed or aperture adjustmen needed to double or halve the amount of light entering the camera.

Exposure: When you take a picture, the camera’s light meter determines how long the shutter should be open for and how wide the aperture should be to obtain the correct exposure. If a picture is too dark, it is said to be underexposed, if its too light, its over-exposed.

EXIF: The Exchangeable Image File (EXIF) format enables image information such as the date and time the shot was taken, plus exposures and othe data, to be stored alongside standard picture information on the camera’s memory card.

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See also: Photography Tips





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