Definition: To compress a file (usually text) using PKZIP or WinZIP, two popular programs. Commonly used to reduce the size of a file to speed up transmission over the internet or an online service.
Definition: To compress a file or files into one file. Commonly used to reduce the size of a file to speed up transmission over the Internet.
Definition: a method of focusing the lens so that the depth of field extends over a preselected range of distances.
Definition: A method of planning film exposure and development to achieve precise control of tones in a print. Pioneered by photographers such as Ansel Adams and Minor White.
Definition: the method of determining exposure and development required for individual scenes, invented by Ansel Adams. It is based on analysis of subject luminosities in terms of ten gray tones, labeled zones 0 through X and previsualizing them as print densities. By measuring each subject luminance with a hand meter it is possible to determine how much the range of values must be contracted or expanded by negative development control to give the required values in the print.
Definition: A way to plan negative exposure and development to achieve precise control of the darkness of various areas in a print.
Definition: Enlarging a portion of an image in order to see it more clearly or make it easier to alter. Opposite of zoom-out, which is useful for viewing the entire image when the full image is larger than the display space. Definition: Making the image or image part become larger (zooming in) or smaller (zooming out) as it appears on the monitor.
Definition: a lens which is constructed to allow continuously variable focal length within a specific range. The effective aperture and focus settings remain unchanged throughout such adjustments.
Definition: A lens in which you adjust the focal length over a wide range. In effect, this gives you lenses of many focal lengths. Definition: A lens of variable focal length. For example, in an 80-200mm zoom lens (for a 35mm camera), the focal length can be changed anywhere between the lower limit of 80mm and the upper of 200mm. This affects the scale of the image on which the lens is focused without throwing the image out of focus.
Definition: Whereas an optical zoom uses the optics (lens) of the digital camera to move you closer to your subject, a digital zoom simply uses the existing image and enlarges it digitally. Enlarging the image digitally reduces picture quality, and should therefore usually be avoided. However, a judicious use of digital zoom may sometimes yield images that are of quite acceptable quality. So, use with caution. What is important when comparing digital cameras is the optical zoom. Digital zoom can always be achieved later in an image editing software, such as Photoshop, so should not really be a determining factor when choosing a digital camera.
