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HP 4050tn HP PCL/PJL reference (PCL 5 Color) - Technical Reference Manual - Page 188

Color Printing Overview Color LaserJet

UPC - 088698769577

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When printing color pages, a user can choose one of several color modes, depending on the desired results. Each color mode has a palette associated with it. Simple Color Mode provides a palette of fully saturated colors whose colors are similar to those of a plotter's pen colors. The palette is nonprogrammable, and is intended for simple printing of items such as bar and pie charts. For applications requiring different or more specific colors, the printer offers the PCL Imaging and HP-GL/2 Imaging Modes. The palette colors in these two modes can be modified to provide the desired result. When choosing color for a particular application, the Color LaserJet printer provides device-dependent and device-independent color (the DeskJet 1200C and 1600C support only device-dependent color). Device-independent color provides accurate color matching based on an absolute color standard. It is preferred when users want a precise color to match the output from another device or to match the color on an existing page. Besides providing device-independent color for precise color matching, the HP printers can modify color to compensate for various characteristics. The Color LaserJet printer supports the following methods of modifying color (the DeskJet 1200C and 1600C printers support halftone algorithms and gamma correction, but not color lookup tables or the Viewing Illuminant command). • Halftone render algorithms determine how colors are rendered using the printers available colors. Halftone algorithms can be used to change apparent resolution, change the texture of images, reduce the number of colors, and change a color image to monochrome. • Color lookup tables can remap colors to compensate for various differences in input data, such as unwanted color casts caused by unbalanced photographic light sources. • Gamma correction provides a way to adjust for color differences in display monitors so that the display more closely matches the printed output. • Since the appearance of colors changes under different viewing light sources, the Viewing Illuminant command allows the application to modify output color based on the light source used to view the printed page. A-2 Color Printing Overview (Color LaserJet, 5, 5M, DeskJet) EN

Section	Page
PCL 5 Color Technical Reference Manual	3
Inside This Manual	5
Manual Organization	6
Related Documents	8
Contents	9
Color Printing Overview	15
Introduction	15
Working with color documents	16
PCL 5 Color Concepts	17
Color	17
Color Specifications and Color Spaces	17
Color Management and the Standard Red, Green, Blue Color Space	18
Palettes and Color Selection	20
PCL 5 Color Graphics Context	20
PCL 5 Color Mode	20
PCL 5 Raster Images	21
Pixels and Pixel Encoding	21
Well-Behaved Raster	23
Using Color Modes	25
Introduction	25
Simple Color Mode	27
PCL Imaging Mode	29
Configure Image Data (CID) Command	29
HP-GL/2 Imaging Mode	37
Using Palettes	39
Introduction	39
Saving the Palette	41
Push/Pop Palette Command	41
Palette Management by ID	43
Select Palette Command	44
Palette Control ID	46
Palette Control	47
Simple Color Palettes	49
CID Color Palettes	51
Device RGB and sRGB Palettes	51
Device CMY Palettes	52
HP-GL/2 Palettes	53
Foreground Color	55
Foreground Color Command	55
Programming Color Palettes	57
Modifying Output Color	59
Introduction	59
Halftone Render Algorithms	60
Render Algorithm Command	60
Monochrome Printing	61
Monochrome Print Mode Command	61
Driver Configuration Command	62
Finish Mode Command	64
The PCL Print Model	65
Introduction	65
Command Sequence	70
Source Transparency Mode Command	71
Pattern Transparency Mode Command	72
Logical Operations	73
Logical Operations and Transparency Interactions	76
Logical Operation Command	77
ROPs in the RGB Color Space	78
ROPs in the CMY Color Space	79
Using a ROP	80
Table of Logical Operations	82
Pixel Placement	88
Pixel Placement Command	91
Filling with Patterns	92
Pattern ID (Area Fill ID) Command	93
Select Current Pattern Command	96
User-Defined Pattern Graphics	97
Using User-Defined Patterns	97
How the Printer Tiles a Pattern	98
Pattern Reference Point	100
Download Pattern Command	102
User-defined Pattern Example	104
Set Pattern Reference Point Command	107
Pattern Control Command	108
Rectangular Area Fills (Rules)	109
Pattern Transparency for Rectangular Area Fill	114
Rectangular Fill Examples	116
Solid Fill (Black/White)	116
Shaded Fill	118
Raster Graphics	121
Introduction	121
PCL 5 Color Raster Graphics	124
Raster Graphics Command Sequence	126
Raster Graphics Resolution Command	128
Raster Graphics Presentation Mode Command	130
Source Raster Height Command	133
Source Raster Width Command	135
Start Raster Graphics Command	137
Raster Y Offset Command	139
Set Compression Method Command	140
Unencoded (Method 0)	141
Run-length Encoding (Method 1)	141
Tagged Image File Format Encoding (Method2)	141
Delta Row Compression (Method 3)	144
Adaptive Compression (Method 5)	148
Transfer Raster Data Commands	152
Transfer Raster Data by Plane	153
Transfer Raster Data By Row/Block Command	153
End Raster Graphics Command	155
Raster Scaling	156
Raster Graphics Example	158
Color Raster Graphics Example	162
Color Vector Graphics (HP-GL/2)	165
Introduction	165
Enter HP-GL/2 Mode	166
MC (Merge Control)	170
PC (Pen Color)	178
NP (Number of Pens)	181
CR (Color Range)	183
PP (Pixel Placement)	184
Color Printing Overview (Color LaserJet, 5, 5M, DeskJet)	187
Introduction	187
Color Concepts	189
Palettes	189
Raster Mode	189
Raster Color vs. Non-Raster Color	189
Device-Dependent vs. Device-Independent Color	190
Black and White References	190
Color Selection	191
Pixel Encoding	192
Encoding by Plane	192
Color Modes	193
Device-Dependent Color Spaces	194
Device-Independent Color Spaces	194
Device-Independent Color	196
Device-Dependent Color	196
Device-Independent Color	196
Color Matching	197
Processing Color Documents	200
Non-Raster Color vs. Raster Color	200
Color Raster Data	200
Using Color Modes (Color LaserJet, 5, 5M, DeskJet)	203
Introduction	204
Simple Color Mode	206
PCL Imaging Mode	208
Configure Image Data (CID) Command	208
Short Form of CID Command (Configure Image Data)	217
Long Form of CID Command (Configure Image Data)	219
HP-GL/2 Imaging Mode	230
Using Palettes (Color LaserJet, 5, 5M, DeskJet)	231
Introduction	231
Saving the Palette	233
Push/Pop Palette Command	233
Palette Management by ID	235
Palette Control ID	238
Palette Control	239
Simple Color Palettes	241
CID Color Palettes	243
HP-GL/2 Palettes	246
Foreground Color	248
Programming Color Palettes	250
Color Component One	250
Color Component Two	250
Color Component Three	251
Assign Color Index	251
Modifying Output Color (Color LaserJet, 5, 5M, DeskJet)	253
Introduction	253
Halftone Render Algorithms	255
Render Algorithm Command	255
User-Defined Dithers	258
Download Dither Matrix Command	259
Multiple Dither Matrices	262
Color Lookup Tables	265
Gamma Correction	269
Viewing Illuminant	270
Monochrome Printing	272
Driver Configuration Command	273

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A-2

Color Printing Overview (Color LaserJet, 5, 5M, DeskJet)

When printing color pages, a user can choose one of several color

modes, depending on the desired results. Each color mode has a

palette associated with it.

Simple Color Mode

provides a palette of

fully saturated colors whose colors are similar to those of a plotter’s

pen colors. The palette is nonprogrammable, and is intended for

simple printing of items such as bar and pie charts. For applications

requiring different or more specific colors, the printer offers the

PCL

Imaging

and

HP-GL/2 Imaging

Modes. The palette colors in these two

modes can be modified to provide the desired result.

When choosing color for a particular application, the Color LaserJet

printer provides

device-dependent

and

device-independent

color (the

DeskJet 1200C and 1600C support only device-dependent color).

Device-independent

color provides accurate color matching based on

an absolute color standard. It is preferred when users want a precise

color to match the output from another device or to match the color on

an existing page.

Besides providing device-independent color for precise color

matching, the HP printers can modify color to compensate for various

characteristics. The Color LaserJet printer supports the following

methods of modifying color (the DeskJet 1200C and 1600C printers

support halftone algorithms and gamma correction, but not color

lookup tables or the Viewing Illuminant command).

•

Halftone render algorithms

determine how colors are rendered

using the printers available colors. Halftone algorithms can be

used to change apparent resolution, change the texture of

images, reduce the number of colors, and change a color

image to monochrome.

•

Color lookup tables

can remap colors to compensate for

various differences in input data, such as unwanted color casts

caused by unbalanced photographic light sources.

•

Gamma correction

provides a way to adjust for color

differences in display monitors so that the display more closely

matches the printed output.

•

Since the appearance of colors changes under different

viewing light sources, the

Viewing Illuminant

command allows

the application to modify output color based on the light source

used to view the printed page.