Operation of ADC
and MEt
The goal of ADC is to automatically and transparently
reduce Memory Out errors caused by raster graphics pages.
MEt extends this goal to reducing all Memory Out errors
and eliminating Print Overrun errors.
During the printing of a page, if available printer memory
becomes low, all HP LaserJet 4, 5, and 6 family printers
and the HP Color LaserJet printer have the ability to
automatically compress any already-stored raster graphics
data using a variety of compression techniques. This allows
the printing of many raster graphics pages which would
have caused a Memory Out error on previous HP LaserJet
printers having the same amount of memory.
With ADC or MEt, PCL 5 printers can typically print a full
page of raster graphics in base memory without a memory
out. This is especially true for line art and typical business
graphics. Other types of graphics such as scanned
photographs (especially if a technique called error-diffusion
is used), cannot always be printed as easily by ADC or MEt
as can line art graphics. Fortunately, another internal
printer feature, Image Adapt, can be called upon to make
the page fit in memory.
Image Adapt
Image Adapt is only used as a last resort for compressing
raster graphics data and as such will rarely be seen. It
reduces a raster graphic image to one-fourth its original
size by trading off some of the image’s fine detail. This loss
of fine detail is often not noticeable.
Image Adapt can be disabled on some of the HP LaserJet 4,
5, and 6 family printers if required, but the technique
varies. On the HP LaserJet 4, 4M and 4Si the user will
have to add more memory to effectively remove the need for
Image Adapt. Image Adapt can be disabled on some of the
other HP LaserJet 4, 5, and 6 family printers by using a
PJL command (refer to the respective printer user manuals
for further information—the Color LaserJet printer does
not utilize Image Adapt). If Image Adapt is turned off, more
pages will cause Memory Out errors.
5-2 Memory Usage
Summary of Contents for PCL 5
Page 8: ...Contents 4 ...
Page 174: ...5 8 Memory Usage ...
Page 198: ...A 24 Printer Commands ...
Page 201: ...8U Roman 8 R8 7J DeskTop DT Internal Symbol Set Charts B 3 ...
Page 202: ...0N ISO 8859 1 Latin 1 E1 19U Windows 3 1 Latin 1 W1 B 4 Internal Symbol Set Charts ...
Page 203: ...12U PC 850 Multilingual PM 10U PC 8 Code Page 437 PC Internal Symbol Set Charts B 5 ...
Page 204: ...12J MC Text MC 10J PS Text TS B 6 Internal Symbol Set Charts ...
Page 205: ...11U PC 8 Danish Norwegian PD 13J Ventura International VI Internal Symbol Set Charts B 7 ...
Page 206: ...1U Legal LG 14J Ventura US VU B 8 Internal Symbol Set Charts ...
Page 207: ...6J Microsoft Publishing PG 9U Windows 3 0 Latin 1 WO Internal Symbol Set Charts B 9 ...
Page 208: ...17U PC 852 Latin 2 PE 9T PC Turkish PT B 10 Internal Symbol Set Charts ...
Page 209: ...9E Windows 3 1 Latin 2 WE 2N ISO 8859 2 Latin 2 E2 Internal Symbol Set Charts B 11 ...
Page 210: ...5N ISO 8859 9 Latin 5 E5 5T Windows 3 1 Latin WT B 12 Internal Symbol Set Charts ...
Page 211: ...9J PC 1004 Code Page 1004 PU 26U PC 775 Code Page 775 PV Internal Symbol Set Charts B 13 ...
Page 212: ...19L Windows Baltic WL 6N ISO 8859 10 Latin 6 E6 B 14 Internal Symbol Set Charts ...
Page 213: ...6M Ventura Math VM 8M Math 8 M8 Internal Symbol Set Charts B 15 ...
Page 214: ...5M PS Math MS 15U Pi Font PI B 16 Internal Symbol Set Charts ...
Page 215: ...19M Symbol Font AS 579L Wingdings Font L Internal Symbol Set Charts B 17 ...
Page 216: ...9L Ventura ITC Zapf Dingbats DV 10L PS ITC Zapf Dingbats DS B 18 Internal Symbol Set Charts ...
Page 218: ...13L ITC Zapf Dingbats series 300 D3 B 20 Internal Symbol Set Charts ...
Page 221: ...Table B 2 Roman 8 Character Conversion Internal Symbol Set Charts B 23 ...
Page 222: ...Table B 2 Roman 8 Character Conversion continued B 24 Internal Symbol Set Charts ...
Page 223: ...Table B 2 Roman 8 Character Conversion continued Internal Symbol Set Charts B 25 ...
Page 224: ...Table B 2 Roman 8 Character Conversion continued B 26 Internal Symbol Set Charts ...
Page 225: ...Table B 2 Roman 8 Character Conversion continued Internal Symbol Set Charts B 27 ...
Page 226: ...Table B 2 Roman 8 Character Conversion continued B 28 Internal Symbol Set Charts ...
Page 227: ...Table B 2 Roman 8 Character Conversion continued Internal Symbol Set Charts B 29 ...
Page 228: ...B 30 Internal Symbol Set Charts ...