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