HP PCL 5 User Manual Page 102

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5-38 The PCL Print Model EN
Download Pattern Command
The Download Pattern command provides the means for
downloading the binary pattern data that defines the user pattern.
? * c # W [pattern data]
The value field (#) identifies the number of pattern data bytes that
follow the Download Pattern command. In addition to the binary
pattern data, there are eight bytes of pattern descriptor (header)
information included in this pattern data. The format for a 300 dpi
resolution header is shown in Table 5-5, below.
Table 5-5. User-Defined Pattern Header (300 dpi resolution)
Format (Byte 0)
This field indicates the downloadable pattern format:
# = Number of pattern data bytes
Default =0
Range = 0 – 32767 (HP Color LaserJet 8500 extends the range
to 0 to 65535; values outside the range are ignored)
Byte 15 - MSB 8 7 LSB-0 Byte
0 Format (0) Continuation (0) 1
2 Pixel Encoding (1) Reserved (0) 3
4 Height in Pixels 5
6 Width in Pixels 7
8 Pattern image
Format 0 1 bit per pixel: black-and-white or foreground color. A
“1” bit indicates black or foreground color for a color
pattern. A “0” indicates either white or transparency,
depending on the source and pattern transparency
modes. A “0” cannot be colored.
Format 1 1 or 8 bits per pixel. This format uses the current
palette. Data is sent pixel by pixel, and the bits/index
field of the pixel encoding byte determines the
number of bits defining a pixel.
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