PCL 5 Raster Images, Pixels and Pixel Encoding | HP instruction

zAn RGB, eight-entry palette with the following colors starting at index 0: black, red, green, yellow, blue, magenta, cyan, and white.

zA CMY, eight-entry palette with the following colors starting at index 0: white, cyan, magenta, blue, yellow, green, red and black.

•PCL Imaging mode is entered with the Configure Image Data command that creates a programmable palette of a programmed size. This palette can be programmed using the color component and set index commands.

•HP-GL/2 Imaging mode is entered when HP GL/2 mode is entered and the initialize command IN creates a programmable palette that is shared between PCL and HP-GL/2.

Any and all of the modes can be used on a page. For example, you could enter the Simple Color mode to print a headline and bar chart, PCL imaging mode to print a photographic image, and Black-and-White mode for the text on the page. Each mode is described in more detail in Chapter 2. “Using Color Modes.”

PCL 5 Raster Images

Monochrome PCL 5 raster images are made up of a series of zeros and ones. A one indicates that a black dot should be deposited, a zero indicates no dot, letting the white background show through. A one-inch wide image with a resolution of 600 dots per inch (DPI) has 600 consecutive zeros and/or ones, which represent a horizontal slice through the image starting at the left edge of the image. This slice is known as a raster row. For an image one inch high and one inch wide, at 600 dpi there are 600 hundred rows of 600 zeros and/or ones. Color raster images follow the same conventions with this major exception: the representation of a dot is changed from a single zero or one to a color specification (a pixel).

Pixels and Pixel Encoding

Raster images can be thought of as being composed of a series of pixels (picture elements). In the case of monochrome raster images, a pixel is a single bit which takes on a value of zero or one. In color images a pixel is essentially a color specification. However, there are several ways of specifying a color, and how the color is specified is called the Pixel Encoding Mode (PEM).

EN	Color Printing Overview 1-7

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HP manual PCL 5 Raster Images, Pixels and Pixel Encoding

Contents

Page Page PCL 5 Color Technical Reference Manual Trademarks Copyright License What You Can Learn From This Manual Inside This Manual Manual Organization Appendix C. Using Palettes Color LaserJet, 5, 5M, DeskJet Color Vector Graphics HP-GL/2Index PCL 5 Printer Language Technical Reference Manual Related DocumentsPCL 5 Comparison Guide Printer Job Language Technical Reference Manual Contents Modifying Output Color Raster Graphics Appendix B Using Color Modes Color LaserJet, 5, 5M, DeskJet Index Contents Introduction Color Printing Overview Working with color documents Color Specifications and Color Spaces PCL 5 Color ConceptsColor Page HP’s ICC profiles are available through normal HP software PCL 5 Color Mode Palettes and Color SelectionPCL 5 Color Graphics Context Pixels and Pixel Encoding PCL 5 Raster Images Row Plane Red Well-Behaved Raster Color Printing Overview Simple Color Mode Black-and-White Mode Default HP-GL/2 Imaging Mode PCL Imaging Mode Simple Color Command Simple Color ModeDefault Range ? *r#U Plane RGB value = Single Plane value =Plane CMY value = Index Color PCL Imaging Mode Configure Image Data CID Command?*v6W b0 b1 b2 b3 b4 b5 Byte Value Color Space Byte 0 Color Space Value Pixel Encoding Restrictions Mode Byte 1 Pixel Encoding Mode PEM 0 Indexed by Plane Example PEM 1 Indexed by Pixel Mode 2 Direct by Plane R7-r0 G7-g0 Byte 2 Number of Bits per Index Bits/Index Indices/Byte Bytes 3, 4, and 5 No. of Bits for Components 1, 2, HP-GL/2 Imaging Mode Using Color Modes Using Palettes Page Push/Pop Palette Command Saving the Palette? *p#P Page Palette Management by ID ?&p#S Select Palette CommandPage ?&p#I Palette Control ID ?&p#C Palette ControlPage Simple Color Palettes Plane CMY value = Device RGB and sRGB Palettes CID Color PalettesBits/Index = Bits/Index = 3 through Bits/Index = Color Device CMY PalettesBits/Index = Bits/Index = 3 through Two Pens HP-GL/2 PalettesFour Pens Pen Number Color Eight Pens Foreground Color Command Foreground Color? *v#S Color raster images Color Component One Programming Color PalettesColor Component Two ? *v#A Assign Color Index Color Component Three?*v#C ?*v#I Modifying Output Color Halftone Render Algorithms Render Algorithm CommandDevice Best Dither ? *t#J Monochrome Print Mode Command Monochrome Printing?&b#M Deviceid Driver Configuration CommandFunctionindex Select Treatment Screen Match Treatment Command Other Color LaserJet Finish Mode Command Default =?&b#F PCL Print Model PCL Print Model Opaque and Transparency Modes Page Effect of Transparency Modes on Images Operation Comments Command Sequence Source Transparency Mode Command Default? * v # N ? * v # O Pattern Transparency Mode Command Definitions Logical Operations Operators OperandsOperation Logical Operations and the Print Model Logical Operations and Transparency Interactions Logical Operation Command ?*l # ORoprgb 252 Texture Source Destination ROPs in the RGB Color Space ROPs in the CMY Color Space CMY ROP Truth Tables Using a ROP Example Table of Logical Operations Logical Operations ROP3 Boolean Input Value Function Function Input Value Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean Pixel Placement Pixel Placement Pixel Placement Variations ?*l # R Pixel Placement Command Patterns for Text and Raster Images Filling with PatternsPatterns for Rectangles HP-GL/2 Patterns Selecting User-Defined patterns1 Pattern ID Area Fill ID Command Shading Patterns Cross-Hatch Patterns ? * v # T Select Current Pattern Command User-Defined Pattern Graphics Using User-Defined Patterns How the Printer Tiles a Pattern 10 Pattern Layout Across the Printable Area Pattern Reference Point 11 Moving Pattern Reference Point for Pattern Filling Format Byte Download Pattern Command Pixel Encoding Byte Continuation ByteReserved Byte Height in Pixels Bytes 4 User-defined Pattern Example Page Previous example, the raster data code is presented ? * p # R Set Pattern Reference Point Command ? * c # Q Pattern Control Command Rectangular Area Fills Rules Horizontal Rectangle Size Decipoints Horizontal Rectangle Size PCL Units? * c # a ? * c # H Vertical Rectangle Size Decipoints Vertical Rectangle Size PCL Units? * c # B ? * c # ? * c # P Fill Rectangular Area Printer Language Technical Reference Manual for logical Pattern Transparency for Rectangular Area Fill 12 Effect of Transparency Modes on Rectangular Areas Solid Fill Black/White Rectangular Fill Examples 13 Solid Fill Example Shaded Fill Page PCL Print Model Raster Graphics Page Image Type Number Bits per Components Raster Area PCL 5 Color Raster GraphicsPage Well-Behaved Raster Command Sequence Raster Graphics Command Sequence Emphasis in the previous command sequence is that the Raster ? * t # R Raster Graphics Resolution Command Raster Graphics Expansion at 300 dpi Raster Graphics Presentation Mode Command Default = Range = 0? * r # F Raster Graphics Presentation Mode for Portrait Orientation Raster Graphics Presentation Mode for Landscape Orientation ? * r # T Source Raster Height Command Maximum Raster Height ? * r # S Source Raster Width Command Maximum Raster Width ? * r # a Start Raster Graphics CommandPage ? * b # Y Raster Y Offset Command Set Compression Method Command Run-length Encoding Method Unencoded MethodTagged Image File Format Encoding Method ? * b # M # of Bytes Binary value Decimal value 0000 127 0111 Unencoded Examples Run-length and Tiff Compression Delta Row Compression Method Command byte1 to 8 Replacement bytesRun-length Encoding Tiff EncodingPage Seed Row Repeating a Row Printing a Zeroed Row Setting the Seed Row to ZeroExample Delta Row Compression 11111111 Row 00001111 11111111 10101010 Adaptive Compression Method Value Compression Operation Duplicate Row Empty Row Comparison Guide for specifics Adaptive Compression Operation Hints Transfer Raster Data Commands Transfer Raster Data by Plane Transfer Raster Data By Row/Block Command ?*b2m3W binary data Byte Counts and the Tiff v4.0 Compression Mode ? * r C End Raster Graphics Command Resolution Scaling Raster ScalingArbitrary Scaling Destination Raster Height Destination Raster Width? * t # H ? * t # Raster Graphics Example Page Page Example of Raster Graphic Image Data Color Raster Graphics Example PCL Command Description Command Arguments Raster Graphics Raster Graphics Color Vector Graphics HP-GL/2 ?%#B Enter HP-GL/2 ModePage Default Settings when Entering HP-GL/2 Page MC Merge Control Default Pixel Combinations Desired Destination Values Page Logical Operations ROP3 Boolean Input Value Function Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean Logical Operations ROP3 Boolean PC Pen Color Parameter Format Functional Range Default Yellow Shading Fill Type command FT10, the shading levels are NP Number of Pens Page CR Color Range PP Pixel Placement Pixel Placement PP, Pixel Placement Command Mode Clamped integer Grid IntersectionParameter Format Functional Color Printing Overview Color LaserJet, 5, 5M DeskJet Page Color Concepts Raster ModePalettes Raster Color vs. Non-Raster Color Black and White References Device-Dependent vs. Device-Independent Color Scenario White Reference Black Reference Color Selection Encoding by Plane Pixel Encoding Encoding by Pixel Color ModesC4 c3 c2 c1 Planar Encoding Pixel Encoding Device-Independent Color Spaces Device-Dependent Color SpacesPage Device-Independent Color Device-Dependent ColorDevice-Independent Color Color Matching Color Lookup Tables Color Appearance Matching Illumination Models Non-Raster Color vs. Raster Color Processing Color DocumentsColor Raster Data Marking Primitives Color Processing Functions Color Printing Overview Color LaserJet, 5, 5M, DeskJet Using Color Modes Color LaserJet, 5, 5M DeskJet Introduction HP-GL/2 Imaging Mode Simple Color Mode Simple Color palettes are shown below ?*v#Wbinary data Common 6-Byte Header Byte 15 MSB LSB Color space Ubyte Pixel encoding modeBits/index Bits/primary #1 Bits/primary #2 Bits/primary #3 Byte Value Pixel Encoding Mode Restrictions Mode 0 Indexed by Plane Mode 1 Indexed by Pixel Mode 2 Direct by Plane Bytes are always 1 for this Byte 3 Number of Bits for Primary #1 Byte 5 Number of Bits for Primary #3 Byte 4 Number of Bits for Primary #2 Short Form of CID Command Configure Image Data Data Range Scaling Long Form of CID Command Configure Image Data Device RGB Long FormByte 15 msb Lsb CIE L*a*b* Long Form Device CMY Long Form Byte 15 msb Lsb Sign Exponent Fractional Portion Colorimetric RGB Long Form Byte 15 msb Lsb Luminance-Chrominance Long Form Byte 15 msb Lsb Byte 15 msb Lsb Device RGB or Device CMY Examples Using the CID Command CIE L*a*b Non-Linear Smpte RGB, 2.2 Gamma, 1.0 GainNon-Linear Sony Trinitron YUV Chrominance-Luminance with Sony Trinitron YUV Chrominance-Luminance Color Space HP-GL/2 Imaging Mode Using Palettes Color LaserJet, 5, 5M DeskJet Page Saving the Palette Page Palette Management by ID Select Palette Command Page Palette Control ID Palette Control Page Using Palettes Color LaserJet, 5, 5M, DeskJet C-11 Plane CMY value = Device RGB Palettes Bits/Index = 3 through Device CMY and Device-Independent Palettes HP-GL/2 Palettes Using Palettes Color LaserJet, 5, 5M, DeskJet C-17 ?*v#S Foreground Color Command Color raster images Color Component Two Color Component One?*v#A ?*v#B Assign Color Index Color Component Three Using Palettes Color LaserJet, 5, 5M, DeskJet Modifying Output Color Color LaserJet, 5, 5M DeskJet Page ?*t#J Error Diffusion Snap to PrimariesSnap Black to White, Colors to Black Ordered Dither and Clustered Ordered Dither Monochrome RenderingUser-Defined Dithering Non-Continuous Tone Algorithms User-Defined Dithers Download Dither Matrix Command Byte 15 msb Lsb Number of Planes FormatHeight and Width Data Bytes Multiple Dither Matrices Example Byte 15 msb Lsb Color Lookup Tables Color Lookup Tables Command Figure D-1 Color Lookup Tables Byte 15 msb Lsb Value Color Space Gamma Correction Command Gamma Correction?*t#I Viewing Illuminant Viewing Illuminant Command Illuminant Chromaticity Monochrome Print Mode Command Function Description Argument Range Index Value Printer Color LaserJet printer Lightness SaturationScaling Process Blue No AdjustmentTransparency Out of Gamut Download Color Map Setting Description MapID Device Dependent Setting Description MapID Setting Description MapID Device-Independent Index Index-2 Index-3 Index-4 Index-5 Index-6