Glossary of Terms for digital camera
Automatic Exposure : A camera operation which allows the camera to automatically set the most appropriate aperture and shutter speed, depending on current lighting conditions.Auto Flash : Auto flash means the camera has a built-in flash that fires automatically when more light is needed to compose the picture.
Autofocus : The camera focuses automatically on the subject in the centre of the viewfinder when you press the shutter release button.
Burst Mode : The burst mode enables you to take 2 or 3 consecutive pictures in a set time frame.
Digital Zoom : Camera feature involving enlarging the central part of an image to give a similar effect to a telephoto lens. Basically working like a crop.
Download : The transfer of files or other information from one piece of computer equipment to another (such as when transferring pictures from a digital camera to a computer).
Exposure : Exposure control is used to compensate poor light conditions such as strong backlighting, low contrast and insufficient ambient light.
Flash Memory : A type of fast memory chip that remembers all its data even when the power is turned off.
Internal Storage : Some digital cameras have additional built-in memory (although it has been replaced by removable media on most models).
Interpolation : By using special software the resolution can be increased. Pixels are analysed in colour and brightness and new pixels are added by calculating the values of the surrounding pixels.
JPEG : A file format that stores digital images in a very space-efficient way. Used by virtually all digital cameras.
Mega Pixel : A measure of resolution that reflects the ability of a digital camera to record detail. The more megapixels a camera has, the more detail its images can contain and the more they can be enlarged without losing clarity.
Optical Zoom : This is the true measure of the focal length of the lens. Optical zoom magnifies the size of an image by adjusting the lens. Unlike digital zoom, optical zoom enlarges the subject without sacrificing resolution.
Pixels : Smallest element of a digitised image. One of the tiny points of light that makes up an image on a computer screen. See Mega Pixel.
Resolution : The amount of pixels an image exists of. The higher the resolution, the more detailed the picture will be.
A VGA resolution (640 x480) is ideal for small print-outs and computer use. XGA (1024 x 768) and SXGA-resolutions (1280 x 1024) will offer even more detail. A UXGA resolution of 1600 x 1200 approaches photo quality.
Secure Digital Memory : Also known as SD memory, a Secure Digital memory card is used to store data such as video and photographs. It can then be used to easily transfer the video and photos to your PC or TV. Secure Digital cards are appearing in more and more digital cameras and are currently the most widely used card. The reason for their popularity is their small size coupled with more than useful storage capacity.
Self Timer : A time delay feature giving you a few seconds before the picture is taken. This allows you to use the camera on a tripod for long exposure shots or to be in the photograph yourself.
Shutter Speed : The time the shutter on a camera is open. Usually done for you by the electronics inside some cameras.
USB : Stands for Universal Serial Bus. It is a high speed data port on computers and peripherals. USB is used for transferring data from e.g. a digital camera to a computer. The data transfer is very fast.
Viewfinder : A window on the camera which you can look through to compose photographs.
White Balance : In digital camera terms, an adjustment to ensure colours are captured accurately whatever the lighting used. Can be set automatically, using presets for different lighting types or measured manually.
Interpolated: Most software programs can enlarge image resolution beyond the actual resolution by adding extra pixels. This normally decreases the quality of the image but can be enhanced by a program (or plug in for Photoshop) such as LizardTech´s "Genuine Fractals".http://www.google.co.uk/url?sa=X&start=1&oi=define&q=http://www.all-things-photography.com/digital-dictionary.html
Shutter speed:
The time for which the CCD is exposed during an exposure. Fast (short) shutter speeds (hundredths or thousandths of a second) prevent Camera Shake and can freeze motion in photos. Slow shutter speeds allow exposures in low light and can be used for special blur effects.www.totaldp.com/glossary.cfm
Determines the amount of time that the film or electronic photo receptor is exposed to light from the scene. Selected to give correct exposure so as to give a balanced negative or electronic image. Fast shutter speed to give a short exposure in a bright daylight setting and slow shutter speed or long exposure in indoor dull conditions. Note that a long exposure might lead to blurring of a moving subject or where the camera is hand held.www.view-link.com/dir-s.html
Video Resolution: (20 fps real) 30 fps is better
Resolution:
160X120pixels(QVGA)
352x288pixels(CIF),
640x480 pixels (VGA),
MEPG-4 : can store 4 times more video than mpg3
Optical zoom: enlarge the image without sacrificing the resolution.
Digital zoom: enlarge the image like crop.
posted by didie @ 9:53 PM
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