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1-4 Color Printing Overview EN
Color can be described in ways other than amounts of red, green, and
blue light. Generally, these color specification systems are known as
color spaces. For example, The Cyan, Magenta, Yellow (CMY) color
space is used to describe colors that are printed by depositing varying
amounts of these three ink pigments (Cyan, Magenta, Yellow). The
absence of pigment is considered to be white, and the presence of all
three is black. The CMYK color space is similar to the CMY color
space, but black pigment is used in place of 100% C, M, Y since
imperfections in the hues of the C, M, Y pigments yield a dark brown
rather than black.
A color specification, then, depends on the color space as well as the
values used to describe a given color. Black in the RGB color space is
described using the three numbers (0, 0, 0), but in the CMY color
space it is described as (100, 100, 100), where the values are
percentages of each color.
Color Management and the Standard Red,
Green, Blue Color Space
For color to be reproduced in a predictable manner across different
devices and materials, it has to be described in a way that is
independent of the specific mechanisms and materials used to
produce it. For instance, color displays and color printers use very
different mechanisms for producing color. Traditionally, operating
systems have supported color by declaring support for a particular
color space (RGB in most cases). However, since the interpretation of
RGB values varies between devices, color was not reliably
reproduced across different devices.
The needs of the very high-end publishing sector could not be met by
the traditional means of color support, so the various computer
operating systems added support for using International Color
Consortium (ICC) profiles to characterize device-dependent colors in
a device-independent way. They used the profiles of the input device
that created an image, and the output device that displayed or printed
the image, to create a transform that moved the image from the color
space of the input device to that of the output device. This resulted in
very accurate color and access to the entire color gamut of both
devices. However, it also involved the overhead of transporting the
profile of the input device with the image and running the image
through the transform.
- PCL 5 Color Technical 3
- Reference Manual 3
- Copyright and 4
- Trademarks 4
- Inside This Manual 5
- Manual Organization 6
- Related Documents 8
- Contents 9
- Chapter 5 The PCL Print Model 10
- Chapter 6 Raster Graphics 11
- DeskJet) 12
- Contents xii EN 14
- Color Printing 15
- Overview 15
- Working with color documents 16
- PCL 5 Color Concepts 17
- Green, Blue Color Space 18
- PCL 5 Color Graphics Context 20
- PCL 5 Color Mode 20
- Palettes and Color Selection 20
- PCL 5 Raster Images 21
- Pixels and Pixel Encoding 21
- Well-Behaved Raster 23
- EN Using Color Modes 2-9 33
- EN Using Color Modes 2-11 35
- 2-14 Using Color Modes EN 38
- EN Using Palettes 3-7 45
- Device CMY Palettes 52
- Screen Match 63
- ?*o3W (such 63
- ?*o3W843 ?*o3W643 63
- ?*o3W846 ?*o3W646 63
- Finish Mode Command 64
- The PCL Print Model 65
- ?*v#T) command. It 66
- EN The PCL Print Model 5-3 67
- The PCL Print Model 5-5 69
- Command Sequence 70
- ? * v # N 71
- ? * v # O 72
- Logical Operations 73
- Operators 74
- Operands 74
- Operation 74
- ?*l#O) provides 255 possible 75
- Interactions 76
- Logical Operation Command 77
- ROPs in the RGB Color Space 78
- ROPs in the CMY Color Space 79
- Using a ROP 80
- EN The PCL Print Model 5-17 81
- Table of Logical Operations 82
- EN The PCL Print Model 5-19 83
- EN The PCL Print Model 5-21 85
- EN The PCL Print Model 5-23 87
- Pixel Placement 88
- EN The PCL Print Model 5-25 89
- ?*l#R) and the HP-GL/2 Pixel 90
- Pixel Placement Command 91
- Filling with Patterns 92
- ? * c # G 93
- 5-30 The PCL Print Model EN 94
- Figure 5-7 Shading Patterns 94
- The PCL Print Model 5-31 95
- ? * v # T 96
- User-Defined Pattern Graphics 97
- The PCL Print Model 5-35 99
- Pattern Reference Point 100
- The PCL Print Model 5-37 101
- Download Pattern Command 102
- EN The PCL Print Model 5-39 103
- User-defined Pattern Example 104
- EN The PCL Print Model 5-41 105
- ? * p # R 107
- Pattern Control Command 108
- EN The PCL Print Model 5-45 109
- ? * c # A 110
- ? * c # H 110
- ? * c # B 111
- ? * c # V 111
- Fill Rectangular Area 112
- ? * c # P 112
- ?*v#T) command 113
- The PCL Print Model 5-51 115
- Rectangular Fill Examples 116
- The PCL Print Model 5-53 117
- Shaded Fill 118
- The PCL Print Model 5-55 119
- 5-56 The PCL Print Model EN 120
- Raster Graphics 121
- EN Raster Graphics 6-3 123
- PCL 5 Color Raster Graphics 124
- EN Raster Graphics 6-5 125
- EN Raster Graphics 6-7 127
- ? * t # R 128
- Raster Graphics 6-9 129
- ? * r # F 130
- EN Raster Graphics 6-11 131
- 6-12 Raster Graphics EN 132
- Source Raster Height Command 133
- ?*rC) command, the cursor 134
- Source Raster Width Command 135
- 6-16 Raster Graphics EN 136
- Start Raster Graphics Command 137
- Raster Y Offset Command 139
- Unencoded (Method 0) 141
- (Method 2) 141
- ?*b0m7WUUUUATT 143
- EN Raster Graphics 6-25 145
- Seed Row 146
- EN Raster Graphics 6-27 147
- ?*b3m2W(00000001)(11111111) 148
- ?*b2W(00000010)(11110000) 148
- EN Raster Graphics 6-29 149
- Empty Row 150
- Duplicate Row 150
- EN Raster Graphics 6-31 151
- Transfer Raster Data Commands 152
- Transfer Raster Data by Plane 153
- ?*b2m3W [binary data] 154
- End Raster Graphics Command 155
- Raster Scaling 156
- EN Raster Graphics 6-37 157
- Raster Graphics Example 158
- EN Raster Graphics 6-39 159
- Raster Graphics 6-41 161
- Color Raster Graphics Example 162
- 6-44 Raster Graphics EN 164
- Color Vector Graphics 165
- (HP-GL/2) 165
- Enter HP-GL/2 Mode 166
- ?%1B and ?%3B only) 168
- ?E or control panel reset): 168
- MC (Merge Control) 170
- PC (Pen Color) 178
- NP (Number of Pens) 181
- ?*r#U) or ?E 182
- CR (Color Range) 183
- PP (Pixel Placement) 184
- Figure 7-1 Pixel Placement 185
- PP, Pixel Placement Command 186
- (Color LaserJet, 5, 5M 187
- Color Concepts 189
- Black and White References 190
- Color Selection 191
- Pixel Encoding 192
- Encoding by Plane 192
- Color Modes 193
- Device-Dependent Color Spaces 194
- ?*t7J, ?*t8J) 195
- ?*t11J, ?*t12J) 195
- Device-Independent Color 196
- Color Matching 197
- Color Appearance Matching 198
- Color Lookup Tables 198
- Illumination Models 199
- Processing Color Documents 200
- Color Processing Functions 201
- Using Color Modes 203
- Introduction 204
- HP-GL/2 Imaging Mode 205
- Simple Color Mode 206
- Single Plane (value = 1) 207
- 3-Plane RGB (value = 3) 207
- 3-Plane CMY (value = –3) 207
- PCL Imaging Mode 208
- Common 6-Byte Header 209
- Byte 0 (Color Space) 209
- Byte 1 (Pixel Encoding Mode) 210
- Image Data) 217
- ?*v6W[0x04, . . . ] 218
- Data Range Scaling 218
- Device CMY (Long Form) 220
- CIE L*a*b* (Long Form) 220
- Colorimetric RGB (Long Form) 222
- ?*v#W) is shown as 227
- Device RGB or Device CMY 227
- Example: 227
- CIE L*a*b* 228
- Non-Linear Sony Trinitron 228
- Using Palettes 231
- Saving the Palette 233
- Palette Management by ID 235
- ?&p#S), Palette Control 236
- Select Palette Command 236
- ?&p#S 236
- ?&p44i6c44S 237
- Palette Control ID 238
- Palette Control 239
- Simple Color Palettes 241
- CID Color Palettes 243
- Bits/Index = 3 through 8 244
- Bits/Index = 1 245
- Bits/Index = 2 245
- HP-GL/2 Palettes 246
- Eight Pens 247
- Foreground Color 248
- ?*v#S) is issued: 249
- ?&b#M) immediately 249
- Programming Color Palettes 250
- Color Component Three 251
- Assign Color Index 251
- Modifying Output Color 253
- Halftone Render Algorithms 255
- Snap to Primaries 256
- Device Best Dither 256
- Error Diffusion 256
- Monochrome Rendering 257
- User-Defined Dithering 257
- User-Defined Dithers 258
- ?*m#W[data] 259
- Number of Planes 261
- Height and Width 261
- Data Bytes 261
- Multiple Dither Matrices 262
- Gamma Correction 269
- Viewing Illuminant 270
- Monochrome Printing 272
- Driver Configuration Command 273
- Lightness 274
- Saturation 274
- Select Treatment 274
- Download Color Map 276
- Index-1 279
- Index-2 EN 280
- Index-4 EN 282
- Index-6 EN 284
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