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Set Compression Method Command 15-27
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.
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The compression methods cannot be mixed within one raster row.
A raster row must be compressed using only one method.
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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.
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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.
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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.
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For duplicate and empty rows a row length value of zero does not
update the cursor, however, the seed row is initialized to zero.
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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.
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For method 1, run length encoded, if the row length is odd, the
cursor is incremented and the row data is skipped (thrown away),
and the seed row is left unchanged.
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For method 1, a row length value of zero increments the cursor
and zero fills the seed row.
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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.
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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.
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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.
Summary of Contents for LaserJet 4100
Page 1: ...Part I Click here to access Part II on hp com ...
Page 2: ......
Page 26: ...Contents 14 EN ...
Page 44: ...2 10 The Page EN ...
Page 54: ...3 10 The Print Environment EN ...
Page 70: ...4 16 PCL Job Control Commands EN ...
Page 80: ...5 10 Page Control Commands EN Figure 5 3 Changing Print Direction on a Page ...
Page 82: ...5 12 Page Control Commands EN Figure 5 4 Text Area Within the Page ...
Page 110: ...6 16 Cursor Positioning EN ...
Page 120: ...7 10 Fonts EN Figure 7 11 Bitmap Character Figure 7 12 Scalable Character ...
Page 122: ...7 12 Fonts EN ...
Page 152: ...8 30 PCL Font Selection EN ...
Page 166: ...9 14 Font Management EN ...
Page 182: ...10 16 User Defined Symbol Sets EN ...
Page 237: ...EN Character Descriptor Formats 11 55 Figure 11 5 Class 2 Character Data ...
Page 240: ...11 58 Soft Font Creation EN Figure 11 6 Portrait Character Example ...
Page 241: ...EN Character Descriptor Formats 11 59 Figure 11 7 Landscape Character Example ...
Page 270: ...13 4 The PCL Print Model EN Figure 13 3 Effect of Transparency Modes on Images ...
Page 276: ...13 10 The PCL Print Model EN Figure 13 4 Shading Patterns ...
Page 277: ...EN Pattern ID Area Fill ID Command 13 11 Figure 13 5 Cross Hatch Patterns ...
Page 290: ...13 24 The PCL Print Model EN ...
Page 297: ...EN Pattern ID Area Fill ID Command 14 7 Figure 14 1 Shading Patterns ...
Page 298: ...14 8 PCL Rectangular Area Fill Graphics EN Figure 14 2 Cross hatch Patterns ...
Page 341: ...EN Raster Graphics Example 15 33 Figure 15 11Example of Raster Graphic Image Data ...
Page 342: ...15 34 Raster Graphics EN ...
Page 370: ...16 28 Status Readback EN ...