HP 2200dn HP PCL/PJL reference - PCL 5 Comparison Guide - Page 199
Additional MEt Features, ADC and MEt Notes, Memory Usage 5-3
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ENWW Additional MEt Features With MEt, font data can also be compressed. All downloaded bitmap characters and characters scaled from internal or downloaded scalable outlines can be compressed. The amount of memory savings varies with the size of the characters involved (larger is better) but character sizes can typically be cut in half. This allows roughly twice as many fonts to be downloaded or scaled using a MEt-enhanced LaserJet printer as previously allowed on printers without MEt. In prior PCL 5 printers, if the page could not be rendered as fast as the laser printed it, a Print Overrun error occurred unless page protection was manually turned on and memory was added to accommodate it. With MEt, the manual setting of Page Protection and the additional memory required to facilitate it is obsolete. MEt automatically assesses the complexity of the page being printed and if too complex turns on a new form of page protection which uses compression to remove the requirement for additional memory. In rare circumstances MEt's assessment of the page may prove to be incorrect. For these cases there is some amount of control over this Page Protection process depending upon which MEt-equipped printer is being used. Page Protection may be explicitly turned on or off to avoid the complexity assessment and either always or never perform the page protection process. See the appropriate user manual for details. MEt also includes other internal memory-saving techniques which improve the amount of memory required for the printer's internal representation of your page. ADC and MEt Notes For raster graphics compression to perform at its best it is recommended that the "Recommendations For Sending Data to the Printer," described below, be followed. Character bitmaps can only be compressed if they can be stored uncompressed in contiguous printer memory first. This requirement implies that large point size characters may require more printer memory than would seem necessary. During MEt's Page Protection, portions of the internal representation of the page are discarded to make room for other aspects of the page protection process. If a memory out condition occurs during this Memory Usage 5-3