Each and every horizontal strip of dots across the page is known as a raster line or scan line. Creating the image to be printed is done by a Raster Image Processor (RIP), naturally built into the laser printer. The basic material may be encoded in any number of special page description languages such as Adobe PostScript (PS) , HP Printer Command Language (PCL), or Microsoft XML Page Specification (XPS) , as well as unformatted text-only data. The Raster Image Processor uses the page description language to make a bitmap of the final page in the raster memory. Once the entire page has been rendered in raster memory, the printer is ready to start the process of sending the rasterized stream of dots to the paper in a continuous stream.
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