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Interlacing

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When referring to a computer monitor or another display, interlace or interlacing is a description of how the picture is created. With an interlaced display the picture is created by scanning every other line, and on the next scan, scanning every opposite line. Interlacing allows for a faster refresh rate by having less information during each scan at a lower cost. Unfortunately, this may cause flickering or noticeable line movements in some situations.

When referring to an interlaced graphic image, such as an interlaced GIF or progressive JPEG these are images that are displayed by loading every other line of the image and when at the bottom starting over and loading every opposite line. For users with slow Internet connections (e.g. modem) or when downloading a very large image progressive images appear to fade in as they load.

Also see: GIF, JPEG, Noninterlaced, Progressive, Raster, Refresh, Video terms

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