Adaptive Compression Operation Hints | HP L 5 instruction

	Adaptive Compression Operation Hints

Note	Some HP LaserJet printers perform internal compression techniques
	to support full-page graphics. Refer to Chapter 1 of the PCL 5
	Comparison Guide for specifics.

•The compression methods cannot be mixed within one raster row. A raster row must be compressed using only one method.

•The cursor position is updated with each row of the raster block. The cursor position is also incremented when a block count of less than 3 is sent.

•A Raster Y-Offset command moves the entire block of raster data and initializes the seed row to zeros. The seed row is set to zero even if the y-offset is zero.

•Block size takes precedence over row length. If the row length of any line exceeds the block size, the row length is truncated to the block size.

•For duplicate and empty rows, a row length value of zero does not update the cursor, however the seed row is initialized to zero.

•If an unsupported command byte for a raster row is encountered, the remaining bytes for the block are skipped, the seed row is cleared, and the cursor is not incremented.

•For method 1, run length encoded, if the row length is odd, the cursor is incremented, the row data is skipped (thrown away), and the seed row is left unchanged.

•For method 1, a row length value of zero increments the cursor and zero fills the seed row.

•For method 2, TIFF, if row length terminates the data before the control byte value is satisfied (literal byte count greater than row length), the data following the control byte, if any, is printed as text. The cursor is incremented.

•For Method 2—if row length is equal to one, the one byte is consumed from the I/O and the cursor is incremented. The data is ignored and the seed row is zeroed.

•For Method 3—delta row compression, within an adaptive compression block, the seed row is updated by every raster compression method or type of row. For example, a row compressed with Method 2, TIFF, updates the seed row, while the effect of an empty row initializes the seed row to zeros. Maintaining the seed row allows Method 3 to be mixed with other methods to achieve optimal compression performance.

EN	Raster Graphics 6-31

Image 151

HP L 5 manual Adaptive Compression Operation Hints, Comparison Guide for specifics

Contents

Page Page PCL 5 Color Technical Reference Manual Trademarks Copyright License What You Can Learn From This Manual Inside This Manual Manual Organization Color Vector Graphics HP-GL/2 Appendix C. Using Palettes Color LaserJet, 5, 5M, DeskJetIndex 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 PCL 5 Color Concepts Color Specifications and Color SpacesColor Page HP’s ICC profiles are available through normal HP software Palettes and Color Selection PCL 5 Color ModePCL 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 ? *r#U Simple Color ModeSimple Color Command Default Range Index Color Single Plane value =Plane RGB value = Plane CMY value = Configure Image Data CID Command PCL Imaging Mode?*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 Saving the Palette Push/Pop Palette Command? *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 = 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 Foreground Color Foreground Color Command? *v#S 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 Monochrome Printing Monochrome Print Mode Command?&b#M Select Treatment Driver Configuration CommandDeviceid Functionindex Screen Match Treatment Command Other Color LaserJet Default = Finish Mode Command?&b#F PCL Print Model PCL Print Model Opaque and Transparency Modes Page Effect of Transparency Modes on Images Operation Comments Command Sequence Default Source Transparency Mode Command? * v # N ? * v # O Pattern Transparency Mode Command Definitions Logical Operations Operands OperatorsOperation Logical Operations and the Print Model Logical Operations and Transparency Interactions ?*l # O Logical Operation CommandRoprgb 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 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 Default = Range = 0 Raster Graphics Presentation Mode Command? * 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 ? * 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 Raster Scaling Resolution ScalingArbitrary 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 Mode Clamped integer Grid Intersection PP, Pixel Placement CommandParameter Format Functional 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-Dependent Color Device-Independent ColorDevice-Independent 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 Device RGB Long Form Long Form of CID Command Configure Image DataByte 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 Non-Linear Smpte RGB, 2.2 Gamma, 1.0 Gain CIE L*a*bNon-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 ?*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 to Primaries Error DiffusionSnap Black to White, Colors to Black Monochrome Rendering Ordered Dither and Clustered Ordered DitherUser-Defined Dithering 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 Gamma Correction Gamma Correction Command?*t#I Viewing Illuminant Viewing Illuminant Command Illuminant Chromaticity Monochrome Print Mode Command Function Description Argument Range Index Value Printer Color LaserJet printer Saturation LightnessScaling 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