HP PCL 5 User Manual Page 103

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EN The PCL Print Model 5-39
Continuation (Byte 1)
This field, byte 1, must be set to “0.” (This byte is for future printer
support and does not currently provide any continuation operation.)
Pixel Encoding (Byte 2)
The bits/index field may be either 1 or 8. If the value is 1, the color of
each pattern dot is specified by a single bit, supporting a two-color
palette, which need not be black and white. If the value is 8, the color
of each pattern dot is specified by one byte of data, allowing 256
colors. If the value of any byte is greater than the current palette size,
the modulo function is applied when rendering.
Reserved (Byte 3)
This field, byte 3, is not currently used and must be set to 0.
Height in Pixels (Bytes 4 and 5)
This field, bytes 4 and 5, identifies the number of raster rows (height)
of the pattern, specified at device resolution. If the height is 0, the
data is ignored and no pattern is defined. Pattern height must be less
than 32767 pixels.
Width in Pixels (Bytes 6 and 7)
This field, bytes 6 and 7, identifies the number of pixels (width) of the
pattern, specified at device resolution. If the width is 0, the data is
ignored and no pattern is defined. Pattern width must be less than
32767 pixels.
Pattern Image
This field contains the raster data for the pattern. Data rows must be
word-aligned. Pattern image data is formatted differently for each
format type (see the data description under “Format (Byte 0)” on the
previous page).
7 5 4 3 0
000 Unused Bits/Index
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