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The term is used, by analogy, for the representation of a single row in Raster data. Scan lines are important in representations of image data, because many image file formats have special rules for data at the end of a scan line. For example, there may be a rule that each scan line starts on a particular boundary (such as byte or even byte). This means that even otherwise compatible raster data may need to be analysed at the level of scan lines in order to convert between formats.


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