brightness The balance of light and dark colors in an image. Scanner function to lighten and darken the image data.
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compression Reduction of the amount of storage space required to save an image. Compressed images are saved more efficiently, resulting in smaller files. For some file formats (such as JPEG), compression also results in loss of image quality. Compressed images take longer to open because they must be decompressed first.
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contrast The relative difference between the dark and light portions of an image. Scanner function or button to lighten and darken the image data.
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dpi Short for "dots per inch". Unit of measure that indicates the image resolution in number of dots per linear inch. The higher the value, the higher the resolution.
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image The bitmapped result of scanning a document. Using hardware, the document is converted into a collection of dots stored in a file that can be processed by the computer.
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kerning In printed texts, some letter pairs have more space between them than others because of their shape and slate. Pair kerning automatically reduces the space between such letter pairs to enhance their appearance. Otherwise, they would be spaced too close or too far apart to be aesthetically pleasing. While the first "WA" and "LT" are non-kerned letter pairs, the second "WA" and "LT" are clearly kerned.
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marker Small rectangle at the window corners and in the middle of the window sides. Markers indicate that the window is selected.
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pixel Short for "picture element". The smallest distinguishable square dot to compose a bitmapped picture. The higher the resolution, the smaller the pixels.
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resolution A measure of the fineness of detail that the scanner produces. The number of pixels of an image file is expressed in dots per linear inch. The higher the resolution, the sharper the image.
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scanner Electronic input device designed to digitize images. Converts physical pictures into bitmapped graphic files that can be processed by a computer.
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scanner standard International communication protocol used by several scanner manufacturers to standardize interfacing between software and scanner. Twain is a major example.
