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HP 1200 HP PCL/PJL reference - PCL 5 Comparison Guide - Page 198

Operation of ADC and MEt, Image Adapt

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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. All HP LaserJet 4, 5, and 6 family printers also include enhancements to improve the internal storage of raster graphics data. 5-2 Memory Usage ENWW

Section	Page
Main Menu	3
Manual Conventions	5
Contents	7
Printer Features	11
Introduction	11
PCL Feature Support	13
PCL 5 Technical Reference Manual Corrections	15
Printable Area	46
Printer-Specific Differences	49
Introduction	49
HP LaserJet III and IIID Printers	49
HP LaserJet IIISi Printer	50
HP LaserJet IIIP Printer	50
Raster Graphics Adaptive Compression (IIIP)	52
HP LaserJet 4 Printer	52
Configuration Command (AppleTalk)	55
HP LaserJet 4Si Printer	58
HP LaserJet 4L Printer	59
HP LaserJet 4ML Printer	60
Logical Operations	61
Logical Operations and Transparency Interactions	63
Logical Operation Command	64
Pixel Placement Command	72
Pixel Placement Command (HP-GL/2)	75
Merge Control Command (HP-GL/2)	76
HP LaserJet 4P and 4MP Printers	78
HP LaserJet 4PJ Printer	79
Text Parsing Method Command	80
Character Text Path Direction Command	81
Font Header Format 16	82
New Font Format Header Segments	83
Description of Font Header Segments	84
HP LaserJet 4PJ Programming Tips	96
Paper Size	107
HP LaserJet 4Plus and 4M Plus Printers	108
HP LaserJet 4V and 4MV Printers	109
Font Header Format 16 Bitmap Font Support	110
Font Header Format	110
Character Definition	115
Limitations	116
HP Color LaserJet Printer	117
AppleTalk Configuration Command	118
HP LaserJet 4LJ Pro Printer	119
HP LaserJet 4LC Printer	119
HP LaserJet 5P and 5MP Printers	120
HP LaserJet 5L Printer	121
HP LaserJet 5Si and 5SiMx Printers	122
Paper (Media) Source Command	123
Output Bin Command	125
Alphanumeric ID Command	126
HP DeskJet 1200C Printer	132
Updated Features	133
Enter HP-GL/2 Mode Command	134
Media Type Command	135
Print Quality Command	136
Negative Motion Command	137
HP DeskJet 1600C Printer	138
HP LaserJet 5 and 5M Printers	144
Text Parsing	144
Two-Byte HP-GL/2 Support	145
Label Mode Command	145
Vertical Writing with Proportional Fonts	148
HP Color LaserJet 5 and 5M Printers	150
HP LaserJet 6P/ 6MP Printers	152
HP LaserJet 5Si Mopier	152
HP LaserJet 6L and LaserJet 6L Gold Printers	153
HP LaserJet 4000 Series Printers	153
HP LaserJet 5000 Series Printers	155
HP LaserJet 8000 Series Printers	157
HP LaserJet 8100 Series Printers	158
HP Color LaserJet 4500 Series Printers	159
Simplified Color Management	159
Color Raster Images	160
Asian Font Support	160
Media Handling	160
Alphanumeric ID Command	162
Color Space Support	162
Changes to PCL 5 Color Commands	162
New PCL 5 Commands	165
Differences with the HP LaserJet 4000 Series Printers	166
HP Color LaserJet 8500 Series Printers	167
HP LaserJet 1100 Series Printers	168
HP LaserJet 2100 Series Printers	168
Internal Typefaces / Fonts and Symbol Sets	171
Introduction	171
Bitmap Fonts and Symbol Sets	172
Scalable Typefaces and Symbol Sets	174
Typeface Selection Differences	183
Print Environment	185
Introduction	185
Memory Usage	197
Introduction	197
Operation of ADC and MEt	198
Image Adapt	198
Additional MEt Features	199
ADC and MEt Notes	199
Recommendations For Sending Data to the Printer	200
Raster Graphics Adaptive Compression (Method5)	203
Printer Commands	205
Introduction	205
Internal Symbol Set Charts	229
Introduction	229
ISO Substitution Table	262
Conversion Table	263
Symbol Set and Typeface Codes	271
Introduction	271
MSL/Unicode Symbol Indexes	293
Introduction	293

Match case Limit results 1 per page

5-2

Memory Usage

ENWW

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.

All HP LaserJet 4, 5, and 6 family printers also include enhancements

to improve the internal storage of raster graphics data.