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IMAGING GLOSSARY

Anti-aliasing (imaging)

A method of filling in data that is missing due to under-sampling.

Anti-aliasing is an algorithm designed to reduce the stair-stepping artifacts (sometimes called jaggies) that result from drawing graphic primitives on a raster grid by interpolating values in-between pixels of contrast. If the intensities of neighboring pixels lie between the background and line intensities, the line becomes slightly blurred, and the jagged appearance is thereby diffused.

This method is most often used with digital high contrast images or when scanning text (see example below).

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