PCL 5 Color Technical Reference Manual - Business Support ...

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Device-Independent Color The PCL language characterizes color as either device-dependent or device-independent. Both categories encompass many color spaces, each with unique characteristics. Device-Dependent Color Device-dependent color is relative to the device's inherent characteristics. For example, the colors produced by plotters are relative to the color of the installed plotter pens. Pen color varies considerably, especially as pens wear out, changing the color of the output. Likewise, for monitor screens, the red, green, and blue screen phosphors determine the colors produced. Fully saturated colors can vary greatly between screens. For printers, the color produced on a page depends on the printer’s subtractive inks or toner (cyan, magenta, yellow, and black). When using device-dependent color, devices receiving relative color specifications for the same color frequently do not produce the same color. For example, a monitor’s saturated red may be different than a plotter’s. In short, the same color page may appear considerably different on different devices. The HP color printers provide device-dependent color specified using either the Device RGB or CMY color spaces. Device-Independent Color In contrast with device-dependent color, device-independent color is based on an absolute color standard—the tristimulus values of human vision. The device, whether a printer or otherwise, is calibrated to match an independent color specification. The color specification is translated in such a way that the resultant color is independent of the device. Examples of color spaces based on absolute standards include Kodak Photo YCC, CIE L*a*b*, YUV, and the proposed YCrCb. Each is a transform from tristimulus CIE XYZ space. A-10 Color Printing Overview (Color LaserJet, 5, 5M, DeskJet) EN
With proper calibration, any device can provide a transform from device-independent color space to the device’s own color space, producing output from different devices that have the same color appearance. For example, if a monitor’s parameters are known (gamma, gain, chromaticity coordinates for each primary, and the white point), the monitor’s RGB pixel information can be transformed into device-independent color. The Color LaserJet printers provide device-independent color specified using either the CIE L*a*b*, Colorimetric RGB, or Luminance-Chrominance color spaces. HP Color LaserJet 5 and 5M printers also provide device independent color specified using either the CIE L*a*b*, Colorimetric RGB or Luminance-Chrominance color spaces. However, HP Color LaserJet 5 and 5M printers are somewhat restricted in what they provide. Details of this can be found in Appendix D. Color Matching When attempting to match color produced by different devices, it is important to know the difference between true color matching and appearance matching. Proper device calibration can achieve true color matching, so that a side-by-side comparison of a printed page with the monitor on which the page was designed will show an exact match. However, true color matching is only satisfactory when using the monitor as a viewing reference. Viewed away from the screen, the printed page may appear flat and unsaturated because printers and monitors have different dynamic ranges. For example, black on the screen appears gray when compared to printed black, which is unacceptable if the intent is pure black. Likewise, the white produced on a monitor screen appears yellow or blue when compared to a white sheet of paper. True color matching would require that gray be printed in the black areas and colored dots be printed in the white areas. EN Color Printing Overview (Color LaserJet, 5, 5M, DeskJet) A-11
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PCL 5 Color Technical Reference Man
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Inside This Manual What You Can Lea
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Chapter 7. Color Vector Graphics (H
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Contents PCL 5 Color Technical Refe
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Rectangular Fill Examples. . . . .
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Programming Color Palettes . . . .
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1 Color Printing Overview Introduct
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The PCL language also allows users
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Note HP’s ICC profiles are availa
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� An RGB, eight-entry palette wit
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Well-Behaved Raster PCL raster imag
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2 Using Color Modes Introduction Th
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Simple Color Mode The Simple Color
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PCL Imaging Mode The PCL Imaging mo
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Byte 1 (Pixel Encoding Mode) This b
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PEM 1: INDEXED BY PIXEL In this mod
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MODE 3: DIRECT BY PIXEL This mode s
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HP-GL/2 Imaging Mode The HP-GL/2 Im
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3 Using Palettes Introduction A pal
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Saving the Palette The current pale
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Palette Management by ID All palett
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When a palette creation command is
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Palette Control The Palette Control
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Simple Color Palettes The Simple Co
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CID Color Palettes The Configure Im
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HP-GL/2 Palettes Regardless of the
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Foreground Color All PCL marking en
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Programming Color Palettes Except f
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4 Modifying Output Color Introducti
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Monochrome Printing The Monochrome
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Screen Match Due to the emergence o
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5 The PCL Print Model Introduction
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Pattern Transparency Mode—The tra
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Figure 5-3 Effect of Transparency M
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Source Transparency Mode Command Th
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Logical Operations The basic print
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Assuming three bits per pixel, the
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Logical Operation Command Specifies
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Table 5-1. RGB ROP Truth Tables ROP
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Note Since PCL logical operations a
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Table 5-4. Logical Operations (ROP3
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Figure 5-5 Pixel Placement Note The
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Pixel Placement Command Determines
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Pattern ID (Area Fill ID) Command T
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Figure 5-8 Cross-Hatch Patterns EN
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User-Defined Pattern Graphics In ad
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Figure 5-10 Pattern Layout Across t
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Figure 5-11 Moving Pattern Referenc
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Continuation (Byte 1) This field, b
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When using the 300 dpi User-Defined
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Set Pattern Reference Point Command
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Rectangular Area Fills (Rules) Rect
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Vertical Rectangle Size (PCL Units)
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Note The current pattern is not app
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This example is a monochrome exampl
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7 Select the white fill and print.
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5 Print the rectangular shaded area
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6 Raster Graphics Introduction A ra
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This pixel format is sufficient to
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An image’s width and height defin
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The emphasis in the previous comman
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Figure 6-2 Raster Graphics Expansio
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Raster Presentation Mode Orientatio
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Source Raster Height Command The Ra
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Source Raster Width Command The Ras
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Start Raster Graphics Command The S
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Raster Y Offset Command The Raster
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The Set Compression Mode command ha
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Note Another method to calculate th
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Page 147 and 148: The seed row is updated by every ra
Page 149 and 150: The size of a block is limited to 3
Page 151 and 152: Adaptive Compression Operation Hint
Page 153 and 154: Transfer Raster Data by Plane This
Page 155 and 156: End Raster Graphics Command The End
Page 157 and 158: Destination Raster Width The Destin
Page 159 and 160: 8 Specify the raster compression mo
Page 161 and 162: Figure 6-7 Example of Raster Graphi
Page 163 and 164: Looking at the PCL commands, you'll
Page 165 and 166: 7 Color Vector Graphics (HP-GL/2) I
Page 167 and 168: � The ?%#A command closes HP-GL/2
Page 169 and 170: Redefining the PCL Picture Frame si
Page 171 and 172: Opcode — Specifies the logical op
Page 173 and 174: Table 7-1. Logical Operations (ROP3
Page 179 and 180: The “PC;” command defaults the
Page 181 and 182: NP (Number of Pens) The NP command
Page 183 and 184: CR (Color Range) The CR command set
Page 185 and 186: Figure 7-1 Pixel Placement EN Color
Page 187 and 188: A Color Printing Overview (Color La
Page 189 and 190: Color Concepts This section describ
Page 191 and 192: Example: Assuming the white and bla
Page 193 and 194: Encoding by Pixel When encoding by
Page 195: Cluster Ordered Dither ( ?*t7J, ?*t
Page 199 and 200: Illumination Models Illumination so
Page 201 and 202: Color Processing Functions Given th
Page 203 and 204: B Using Color Modes (Color LaserJet
Page 205 and 206: HP-GL/2 Imaging Mode In HP-GL/2, th
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Page 209 and 210: Common 6-Byte Header The short and
Page 211 and 212: You need one plane or one bit/pixel
Page 213 and 214: Example: ?*v6W 00 01 04 04 04 04 #
Page 215 and 216: Example: ?*v6W 00 03 00 08 08 08 #
Page 217 and 218: Short Form of CID Command (Configur
Page 219 and 220: Long Form of CID Command (Configure
Page 221 and 222: Note Although the data ranges may e
Page 223 and 224: Byte 15 (msb) 8 7 (lsb) 0 Byte 22 x
Page 225 and 226: Byte 15 (msb) 8 7 (lsb) 0 Byte 22 E
Page 227 and 228: Examples Using the CID Command The
Page 229 and 230: LONG FORM CID(2,3,0,8,8,8 0.62, 0.3
Page 231 and 232: C Using Palettes (Color LaserJet, 5
Page 233 and 234: Saving the Palette The current pale
Page 235 and 236: Palette Management by ID All palett
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Page 239 and 240: Palette Control The Palette Control
Page 241 and 242: Simple Color Palettes The Simple Co
Page 243 and 244: CID Color Palettes The Configure Im
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Eight Pens Pen Number Color 0 White
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Note Foreground color interacts wit
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Color Component Three This command
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D Modifying Output Color (Color Las
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Halftone Render Algorithms The HP c
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Ordered Dither and Clustered Ordere
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A user-defined matrix is defined in
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Format This byte should be set to 0
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Byte 15 (msb) 8 7 (lsb) 0 Byte 0 Fo
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Color Lookup Tables Color lookup ta
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As shown below, the 256 point-by-po
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Gamma Correction Color monitors, wh
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The PCL default viewing illuminant
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Driver Configuration Command This c
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No Adjustment This setting provides
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Setting Description MapID Out of Ga
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Index A adaptive compression block
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transparency mode 5-2 user-defined
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Set Pattern Reference Point command
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