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+hp2xx (vector graphics conversion)
+
+The hp2xx program is a versatile tool to convert vector-oriented graphics
+data given in Hewlett-Packard's HP-GL plotter language into a variety
+of popular graphics formats, both vector- and raster-oriented.
+
+The various supported output formats include Encapsulated PostScript
+(EPS), PCX, IMG, and several formats intended to facilitate the generation
+of graphics within TeX documents. In addition, hp2xx output is printable
+on the HP Laserjet/Deskjet printer series, and it may be used as a HP-GL
+previewer on many platforms.
+
+It can be used as an ImageMagick or GraphicsMagick delegate to convert
+from HPGL format.
+
+Note: hp2xx is built here without PNG output support because it's not
+compatible with modern libpng. If you need to convert HP-GL to PNG,
+use GraphicsMagick, built with hp2xx support.