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HP 1200 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 With MEt, the manual setting of Page Protection and the additional memory required to facilitate it is obsolete.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

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

ENWW

Memory Usage 5-3

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