Luminance - The lightness or brightness of an image. A concept and control in some software that changes or imports only the color lightness information within an image.

Point & Shoot cameras - With these cameras you are looking through a separate window (viewfinder) instead of through the lens. These cameras are less expensive, smaller and easier to carry. The disadvantages are under-powered flash, increased red-eye problems and limited flexibility to add other lenses, flashes, etc.

Dot Pitch - The distance between the dots on a computer monitor, typically 0.2 to 0.3 millimeters. The closer the dots the sharper the image on the monitor.

Digital - A computer's rendition of an image. These digital images can be retouched and enhanced and then printed.

RAW - One of the image formats available on some advanced digital cameras. RAW images are large, usually uncompressed files that, unlike JPEGs, are not processed by the camera and retain all their original data. RAW images are ideal for those who plan on editing their pictures with image-editing software. RAW images may require special software to turn them into a more common format like TIFF or JPEG.

Dot Gain - The effect produced by the expansion of individual dots in a halftone screen when printed onto paper. Dot gain results in a darkening of a printed image and is influenced by the tendency of different papers to absorb ink.

Colorimeter - A device for measuring color values.

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