Cody welch

Mr. Moore

30 definitions

Photography

pixels- the smallest element of an image that can be individually processed in a video display system.

image resolution- is the detail an image holds. The term applies to raster digital images, film images, and other types of images. Higher resolution means more image detail. Image resolution can be measured in various ways.

megabyte -a unit of information equal to 220 bytes or, loosely, one million bytes.

megapixel-a unit of graphic resolution equivalent to one million or (strictly) 1,048,576 (220) pixels.

gigabyte-a unit of information equal to one billion (109) or, strictly, 230 bytes.

jpeg-a format for compressing image files.

raw-A camera raw image file contains minimally processed data from the image sensor of either a digital camera, image scanner, or motion picture film scanner.

tiff- is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general. The format was originally created by the company Aldus for use in desktop publishing.

png-PNG (pronounced ping as in ping-pong; for Portable Network Graphics) is a file format for image compression that, in time, is expected to replace the Graphics Interchange Format (GIF) that is widely used on today's Internet.

white balance-the color balance on a digital camera.

histogram-a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval

aperture-an opening, hole, or gap

shutter speed-the time for which a shutter is open at a given setting.

depth of field-Depth of field is the amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in a photograph. A preferred selection Depth of field ("DOF") in a focused subject in an image can be quite subjective.

aperture priority-an exposure system used in some automatic cameras in which the aperture is selected by the user and the appropriate shutter speed is controlled automatically.

shutter priority-a system used in some automatic cameras in which the shutter speed is selected by the user and the appropriate aperture is then set by the camera.

bitmap-a representation in which each item corresponds to one or more bits of information, especially the information used to control the display of a computer screen.

exposure- in photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance.

watermarking-Also referred to as simply watermarking, a pattern of bits inserted into a digital image, audio or video file that identifies the file's copyright information (author, rights, etc.). The name comes from the faintly visible watermarks imprinted on stationery that identify the manufacturer of the stationery

optical zoom-On a digital camera, optical zoom is a true zoom feature. It allows you to zoom in (or out) on the subject in the LCD or viewfinder. This will enable you to get a closer view of the subject before taking your picture.

digital zoom-Digital zoom is a function of a digital camera used to make the image seem more close-up. Digital zoom on a digital camera works the same as cropping and enlarging a photo in a graphics program.

bracketing-In photography, bracketing is the general technique of taking several shots of the same subject using different camera settings.

light meter-Typically a light meter will include a computer, either digital or analog, which allows the photographer to determine which shutter speed and f-number should be selected for an optimum exposure, given a certain lighting situation and film speed.

image stabilization- image stabilization (IS) is a family of techniques used to reduce blurring associated with the motion of a camera or other imaging device during exposure.

noise- Image noise is random (not present in the object imaged) variation of brightness or color information in images, and is usually an aspect of electronic noise. It can be produced by the sensor and circuitry of a scanner or digital camera.

lag time-the period of time between two closely related events, phenomena, etc., as between stimulus and response or between cause and effect: a time-lag between the declaration of war and full war production. Origin of time-lag Expand.

hot shoe-a socket on a camera with direct electrical contacts for an attached flashgun or other accessory.

fisheye-a wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edges.

macro-photography producing photographs of small items larger than life size.

telephoto-a lens with a longer focal length than standard, giving a narrow field of view and a magnified image.

wide angle- (of a lens) having a short focal length and hence a field covering a wide angle.

DSLR-A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera combining the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.

dynamic range-It's because the difference between the brightest and darkest areas, or 'dynamic range', is so great that you can't find a single exposure that can capture them both. Digital camera sensors can capture a wide range of brightness values, but there is a limit

digital negative- definition of:DNG file Digital NeGative file) A digital camera file format from Adobe that was designed to provide a standard for RAW files (camera vendors have their own proprietary RAW formats).

exposure compensation-Exposure compensation is a technique for adjusting the exposure indicated by a photographic exposure meter, in consideration of factors that may cause the indicated exposure to result in a less-than-optimal image.