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HP Pcl 5 Manual

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    							ENIntroduction 15-3 The final data reduction technique provided by the raster area 
    involves the printer’s ability to fill in trailing zeros to the edge of the 
    raster area. Any zeros following the last “1“ in the raster row to the 
    edge of the picture area need not be sent. The printer automatically 
    fills them. This technique eliminates the need to transmit raster data 
    rows that are all the same length, as required in a raster image which 
    does not use the raster area feature.
    The raster area represents a boundary. Within this boundary the 
    printer zero-fills missing rows and fills in short rows to the edge of 
    the raster area. However, in addition to filling to the boundaries of 
    the raster area, the printer also clips any raster line which extends 
    beyond the boundary. Thus, if an image extends beyond the raster 
    area, then that portion of the image is not printed.
    When the raster area reduction techniques are used in conjunction 
    with the raster compression techniques, a considerable savings in 
    data can be realized. This results in a saving of host storage and 
    data transmission time. However, these reduction techniques do not 
    reduce the amount of printer memory required for page formatting.  
    						
    							15-4   Raster GraphicsEN
    Raster Graphics Command Sequence 
    PCL raster commands include: Start Raster Graphics and End Raster 
    Graphics commands, Transfer Raster Data by Row, Raster 
    Compression, Raster Presentation, Raster Resolution, Raster Height 
    and Raster Width (which define the raster area), and Raster Y Offset 
    commands. The normal sequence of execution for these commands 
    is shown below:
    The emphasis in the previous command sequence is that the Raster 
    Presentation Mode, Raster Resolution, Raster Height, and Raster 
    Width are all set outside the star t..data..end sequence of commands. 
    Also, the entire image is sent during the start..data..end sequence, 
    choosing the most effective compression method for each raster row 
    of data. Table 15-1
    Raster Presentation
    Raster Resolution
    Raster Height
    Raster Width
    Start Raster Graphics
    Y Offset
    Raster Compression
    Transfer Raster Data
          M
    Transfer Raster Data
    Y Offset
    Transfer Raster Data
         M
    Y Offset
    Raster Compression
    Transfer Raster Data
         M
    Raster Compression
    Transfer Raster Data
    End Raster Graphics 
    						
    							ENRaster Graphics Command Sequence 15-5 Raster Presentation, Raster Resolution, Raster Height, Raster Width, 
    and Raster Compression are all true modes. Once specified, the 
    printer remains in that mode unless explicitly changed by issuing 
    the command again, or reset to default values by a soft reset, self 
    test, font printout, or power cycle.
    NoteOnly raster data appearing within the intersection of the logical 
    page, the printable area, the raster width, and height is printed. 
    If raster width and/or raster height have not been set (are defaulted), 
    then the intersection of the logical page and the printable area 
    determines where raster graphics appear; raster data is clipped 
    to the printable area. 
    						
    							15-6   Raster GraphicsEN
    Raster Graphics Resolution Command 
    Raster graphics can be printed at various resolutions. This command 
    designates the resolution of subsequent raster data transfers in 
    dots-per inch.
    E
    C * t # R 
    #  =   75 - 75 dots-per-inch
    100 - 100 dots-per-inch
    150 - 150 dots-per-inch
    200 - 200 dots-per-inch
    1
    300 - 300 dots-per-inch
    600 - 600 dots-per-inch
    Default =75
    Range =75, 100, 150, 200, 300, 600
    This command must be sent prior to the start graphics command. The 
    factory default resolution is 75 dots-per-inch.
    NoteLower resolution graphics occupy less user memory. For example, the 
    number of bits required to represent a two-inch by three-inch image at 
    75 dots-per-inch is 33,750. The same image at 300 dots-per-inch 
    requires 540,000 bits. 
    When configured for 300 dpi resolution, the printer automatically 
    expands raster graphics transferred at resolutions less than 300 
    dots-per-inch to 300 dots-per-inch during printing.  illustrates how a 
    single bit is translated into the corresponding printed dots in various 
    graphics resolutions when the printer is configured for 300 dpi.
    1. Only available if the printer is configured for resolution=600 dpi. 
    						
    							ENRaster Graphics Resolution Command 15-7 Figure 15-3 Raster Graphics Expansion - at 300 dpi
    NoteRectangular area fills and character data are not affected by changes 
    in resolution. Rectangular Area fills and character data always print at 
    the maximum resolution, regardless of the resolution setting.
    When configured for 600 dpi resolution, the printer automatically 
    expands raster graphics transferred at resolutions less than 600 
    dots-per-inch to 600 dots-per-inch during printing.  illustrates how a 
    single bit is translated into the corresponding printed dots in various 
    graphics resolutions when the printer is configured for 600 dpi.
    Figure 15-4 Raster Graphics Expansion - at 600 dpi 
    						
    							15-8   Raster GraphicsEN
    Raster Graphics Presentation Mode Command 
    The Raster Graphics Presentation command specifies the orientation 
    of the raster image on the logical page.
    E
    C * r # F 
    #  =0 - Raster image prints in orientation of logical page
    3 - Raster image prints along the width of the physical 
    page 
    Default =3
    Range =0, 3
    A value of 0 indicates that a raster row ‘will be printed in the positive 
    X-direction of the PCL coordinate system. (The print direction 
    translates the PCL coordinate system.)
    A value of 3 indicates that the raster graphics will be printed along 
    the width of the physical page, regardless of logical page orientation. 
    In portrait orientation, a raster row is printed in the positive X-direction 
    of the PCL coordinate system and a subsequent raster row is printed 
    beginning at the next dot row position in the positive Y-direction. 
    In landscape orientation, a raster row is printed in the positive 
    Y-direction of the PCL coordinate system and a subsequent raster 
    row is printed beginning at the next dot row position in the negative 
    X-direction. Figure 15-5 illustrates presentation mode 0 and 3.
    Table 15-2
    Raster 
    Presentation 
    Mode  Orientation Default Graphics Margin
    0  portrait  logical page left bound
    0  reverse portrait  logical page left bound
    0  landscape  logical page left bound
    0 reverse 
    landscape logical page left bound
    3  portrait  logical page left bound
    3  reverse portrait  logical page left bound 
    						
    							ENRaster Graphics Presentation Mode Command 15-9 Figure 15-5 Raster Graphics Presentation Mode for Portrait 
    Orientation 3  landscape  50 dots in from the logical 
    page top bound
    3 reverse 
    landscape 50 dots in from the logical 
    page top bound Table 15-2  (continued) 
    						
    							15-10   Raster GraphicsEN
    Figure 15-6 Raster Graphics Presentation Mode for Landscape 
    Orientation 
    						
    							ENRaster Height Command 15-11
    Raster Height Command 
    The Raster Height command specifies the height in raster rows of the 
    raster area. Height is the direction perpendicular to the direction that 
    raster rows are laid down, hence, height is subject to the current 
    raster presentation mode and print direction (see Figure 15-7).
    E
    C * r # T
    #  = Height in raster rows 
    Default =N/A
    Range =0 to (logical page length – current Y-position of the
    0,cursor)
    *
    * Greater values default to (logical page length – current Y-position of the cursor)
    This command fills the raster area to the full raster height with zeroed 
    rows. Unspecified rows map to either white or transparent depending 
    on the source transparency mode.
    When a Transfer Raster Data command is received that causes 
    any raster row to extend beyond the row boundary set by the Raster 
    Height command, the row outside the boundary is clipped. This 
    includes the case where the cursor is moved beyond the height 
    boundary with a Raster Y Offset command and the printing of raster 
    data is attempted.
    If you have specified either a raster height or a raster width of 0 
    and a Start Raster Graphics (or Transfer Raster Data) command is 
    received, then the entire raster graphic is clipped. If both a raster 
    height and a raster width are specified (non-zero) and a Start Raster 
    Graphics (or Transfer Raster Data) command is received then the 
    raster area is guaranteed to be logically zeroed-out.
    If the raster height is not set, the raster height is ignored so that no 
    padding or clipping of rows takes place.
    This command is ignored after the Start Raster Graphics or Transfer 
    Raster Data commands until the next End Raster Graphics 
    command.
    NoteOnly raster data appearing within the intersection of the logical page, 
    the printable area, and if set, the raster width and height is printed. 
    Data outside the intersection is clipped. 
    						
    							15-12   Raster GraphicsEN
    Upon receiving an End Raster Graphics (E
    C*rC) command, the 
    cursor position is set to the left graphics margin of the next raster row 
    after the raster height boundary.
    Figure 15-7 Maximum Raster Height 
    						
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