pixel: a minute area of illumination on a display screen, one of many from which an image is composed.
image resolution:  the detail an image holdsmegabytes: a unit of information equal to 2²⁰ bytes or, loosely, one million bytes.gigabytes: a unit of information equal to one billion (10⁹) or, strictly, 2³⁰ bytes.JPEG: a format for compressing image filespsd:  a layered image file used in Adobe PhotoShopwhite balance: the process of removing unrealistic color castshistoram:  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: he distance between the nearest and the furthest objects that give an image judged to be in focus in a 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: the state of being exposed to contact with something.(sun or other light)watermarking: a more or less transparent image or text that has been applied to a piece of paperoptical zoom: allows you to zoom in (or out) on the subject in the LCD or viewfinderdigital zoom:  a method of decreasing the apparent angle of view of a digital photographic or video imagelight meter: an instrument for measuring the intensity of light, used chiefly to show the correct exposure when taking a photographimage stableization:  a method to reduce the likelihood of taking blurry photos by moving the camera lens automatically to compensate for camera movement which can be induced by the user hand-holding the camera, or because the camera is fixed on a platform prone to vibration or movementsnoise:the commonly-used term to describe visual distortionlag time: the period of time between two closely related events, phenomena, etc., as between stimulus and response or between cause and effecthot shoe: a socket on a camera with direct electrical contacts for an attached flashgun or other accessory.fish eye:a wide-angle lens with a field of vision covering up to 180°, the scale being reduced toward the edgesmacro: extreme close-up.
DSLR: 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

 telephoto :a lens with a longer focal length than standard, giving a narrow field of view and a magnified image.
wide angle: having a short focal length and hence a field covering a wide angle.