Shade - The brightness or luminance of an image when compared to a gray scale.

DPI (Dots Per Inch) - The unit of measure used to describe the resolution of image files, scanners, or output devices. The measure of distinct pixels that a device can produce either horizontally or vertically in one inch.

Film Speed - The relative index, also called ISO, of how much light a film requires to be properly exposed. A 100 ISO film requires four times the light of a 400 ISO (speed) film for correct exposure. Rule of thumb - Dull day-high speed, bright day-low speed

Pixel - A term common in computer imaging referring to a picture element.

Saturation - The amount of chroma present in a color. Pastels are low saturation while bright colors are said to be highly saturated.

CCD Array - An arrangement of CCD sensors mounted in close proximity that allows for the simultaneous capturing of many pixels with one exposure.

Kerning - The fine adjustment of the spacing between pairs of type characters in a word to create visually pleasing and consistent spacing.

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