Examples Run-length and Tiff Compression, Unencoded | HP L 5

Note

Note

Another method to calculate the number needed in the control byte for some number of repetitions is to subtract the number of desired repetitions from 256. For example, the control value for 3 repetitions (4 occurrences) of a byte is 256 minus 3 = 253.

A zero or positive value in the control byte means that the subsequent byte or bytes are non-replicated bytes of data. The value of the control byte plus one indicates the number of data bytes that follow. For example, a control byte of 0 means the following 1 byte is literal raster data. A control byte of 6 indicates that the following 7 bytes are literal raster data bytes.

TIFF encoding also allows you to include a non-operative (NOP) control byte, represented by the value -128. This byte is ignored, and the subsequent byte is treated as the new control byte.

It is more efficient to code two consecutive identical bytes as a repeated byte. If these bytes are preceded and followed by literal bytes, however, it is more efficient to code the entire group as literal bytes.

Examples: Run-length and TIFF Compression

The following examples show how a raster row can be coded using run-length and TIFF compression methods. Note that the compression examples use characters to represent the binary data stream.

Byte	#1	#2	#3	#4	#5	#6	#7
Number
Bits	01010101	01010101	01010101	01010101	01000001	01010100	01010100
ASCII	U	U	U	U	A	T	T

Unencoded

?*r1A

?*b0m7WUUUUATT ?*rC

EN	Raster Graphics 6-23

Image 143

HP L 5 manual Examples Run-length and Tiff Compression, Unencoded

Contents

Page Page PCL 5 Color Technical Reference Manual Trademarks Copyright License What You Can Learn From This Manual Inside This Manual Manual Organization Index Appendix C. Using Palettes Color LaserJet, 5, 5M, DeskJetColor Vector Graphics HP-GL/2 Printer Job Language Technical Reference Manual Related DocumentsPCL 5 Printer Language Technical Reference Manual PCL 5 Comparison Guide 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 Color Specifications and Color SpacesPCL 5 Color Concepts Page HP’s ICC profiles are available through normal HP software PCL 5 Color Graphics Context PCL 5 Color ModePalettes and Color Selection 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 ? *r#U Simple Color ModeSimple Color Command Default Range Index Color Single Plane value =Plane RGB value = Plane CMY value = ?*v6W b0 b1 b2 b3 b4 b5 PCL Imaging ModeConfigure Image Data CID Command 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 ? *p#P Push/Pop Palette CommandSaving the Palette 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 = Bits/Index = 3 through CID Color PalettesDevice RGB and sRGB Palettes Bits/Index = Bits/Index = 3 through Device CMY PalettesBits/Index = Color Bits/Index = Pen Number Color HP-GL/2 PalettesTwo Pens Four Pens Eight Pens ? *v#S Foreground Color CommandForeground Color Color raster images ? *v#A Programming Color PalettesColor Component One Color Component Two ?*v#I Color Component ThreeAssign Color Index ?*v#C Modifying Output Color ? *t#J Render Algorithm CommandHalftone Render Algorithms Device Best Dither ?&b#M Monochrome Print Mode CommandMonochrome Printing Select Treatment Driver Configuration CommandDeviceid Functionindex Screen Match Treatment Command Other Color LaserJet ?&b#F Finish Mode CommandDefault = PCL Print Model PCL Print Model Opaque and Transparency Modes Page Effect of Transparency Modes on Images Operation Comments Command Sequence ? * v # N Source Transparency Mode CommandDefault ? * v # O Pattern Transparency Mode Command Definitions Logical Operations Operation OperatorsOperands Logical Operations and the Print Model Logical Operations and Transparency Interactions Roprgb 252 Texture Source Destination Logical Operation Command?*l # O 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 HP-GL/2 Patterns Filling with PatternsPatterns for Text and Raster Images Patterns for Rectangles 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 Height in Pixels Bytes 4 Continuation BytePixel Encoding Byte Reserved Byte 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 ? * c # H Horizontal Rectangle Size PCL UnitsHorizontal Rectangle Size Decipoints ? * c # a ? * c # Vertical Rectangle Size PCL UnitsVertical Rectangle Size Decipoints ? * c # B ? * 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 ? * r # F Raster Graphics Presentation Mode CommandDefault = Range = 0 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 ? * b # M Unencoded MethodRun-length Encoding Method Tagged Image File Format Encoding Method # of Bytes Binary value Decimal value 0000 127 0111 Unencoded Examples Run-length and Tiff Compression Tiff Encoding Command byte1 to 8 Replacement bytesDelta Row Compression Method Run-length EncodingPage Seed Row 11111111 Printing a Zeroed Row Setting the Seed Row to ZeroRepeating a Row Example Delta Row Compression 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 Arbitrary Scaling Resolution ScalingRaster Scaling ? * t # Destination Raster WidthDestination Raster Height ? * t # H 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 Parameter Format Functional PP, Pixel Placement CommandMode Clamped integer Grid Intersection Color Printing Overview Color LaserJet, 5, 5M DeskJet Page Raster Color vs. Non-Raster Color Raster ModeColor Concepts Palettes Black and White References Device-Dependent vs. Device-Independent Color Scenario White Reference Black Reference Color Selection Encoding by Plane Pixel Encoding Planar Encoding Pixel Encoding Color ModesEncoding by Pixel C4 c3 c2 c1 Device-Independent Color Spaces Device-Dependent Color SpacesPage Device-Independent Color Device-Independent ColorDevice-Dependent Color Color Matching Color Lookup Tables Color Appearance Matching Illumination Models Marking Primitives Processing Color DocumentsNon-Raster Color vs. Raster Color Color Raster Data 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 Bits/primary #2 Bits/primary #3 Byte 15 MSB LSB Color space Ubyte Pixel encoding modeCommon 6-Byte Header Bits/index Bits/primary #1 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 Byte 15 msb Lsb Long Form of CID Command Configure Image DataDevice RGB Long Form 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 Non-Linear Sony Trinitron CIE L*a*bNon-Linear Smpte RGB, 2.2 Gamma, 1.0 Gain 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 ?*v#B Color Component OneColor Component Two ?*v#A Assign Color Index Color Component Three Using Palettes Color LaserJet, 5, 5M, DeskJet Modifying Output Color Color LaserJet, 5, 5M DeskJet Page ?*t#J Snap Black to White, Colors to Black Error DiffusionSnap to Primaries User-Defined Dithering Ordered Dither and Clustered Ordered DitherMonochrome Rendering Non-Continuous Tone Algorithms User-Defined Dithers Download Dither Matrix Command Byte 15 msb Lsb Data Bytes FormatNumber of Planes Height and Width 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 ?*t#I Gamma Correction CommandGamma Correction Viewing Illuminant Viewing Illuminant Command Illuminant Chromaticity Monochrome Print Mode Command Function Description Argument Range Index Value Printer Color LaserJet printer Scaling LightnessSaturation Out of Gamut No AdjustmentProcess Blue Transparency 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