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Hewlett-Packard Raster Transfer Language
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<p>The Hewlett-Packard Raster Transfer Language (HP RTL) is a subset of the <a href="/facts/Printer_Command_Language/M7C1zrrg">Printer Command Language</a> (PCL) language. It is used to embed true raster images (bitmaps) into <a href="/facts/Plotter/PEQa8H4p">plotter</a> files. Modern plotters (like HP DesignJets) are raster devices, so they need a raster-based language. For backward compatibility they also support the <a href="/facts/HP-GL%2f2/vLCHzJBY">HP-GL/2</a> (formerly <a href="/facts/HP-GL/vLCHzJBY">HP-GL</a>) vector language, so the HP RTL language is designed for mixing with the HP-GL/2 language. </p>