2001/10/02
CHAPTER 2 "PCL" - 90
<Compressed Image Data>
Data compression compresses the original image data word by word (16 bits).
The comp ressed data consists of both horizontal compression which uses 16 bit, 8 bit and 4 bit repeating patterns
within 1 word or 2 words of data and vertical compression which indicates how many times to repeat the same
data as in the previous line within 1 word of data.
Ÿ
Non-compressed data
When the most significant bit in the first 2 bytes is 0, the printer goes into non-compression mode. The following
11 bits then indicate the number of words of data, the least significant 4 bits are not used. After that, the image
data follows word by word.
15 14
4 3
0
0
data word count (11 bits)
not used
data 1 (16 bits)
:
data n (16 bits)
Ÿ
16 bit repeating compressed data
When the most significant 3 bits in the first 2 bytes are in the order 1, 0, 0, the remaining 13 bits indicate the
number of times to repeat 16 bit data. The following 2 bytes should be the 16 bit data to repeat.
15 14 13 12
0
1
0
0
number of repeats(13 bits)
data to repeat(16 bits)
Ÿ
8 bit repeating comp ressed data
When the most significant 3 bits in the first 2 bytes are in the order 1, 1, 0, the following 5 bits indicate the number
of times to repeat 16 bit (two by 8 bits) data. The remaining 8 bits should be the 8 bit data to repeat.
15 14 13 12
8 7
0
1
1
0
number of repeats
data to repeat(8 bits)
(5 bits)
Ÿ
4 bit repeating compression data
When the most significant 3 bits in the first 2 bytes are in the order 1, 0, 1, the following 4 bits are the 4 bit data to
repeat. The remaining 9 bits indicate the number of times to repeat the 16 bit (4 by 4 bits) data.
15 14 13 12
9 8
0
1
0
1
data to repeat
number or repeats(9 bits)
(4 bits)
Ÿ
Vertical repeating compressed data
When the most significant 3 bits in the first 2 bytes are in the order 1, 1, 1, the remaining 13 bits indicate the same
data words as in the previous line.
15 14 13 12
0
1
1
1
the same data words as in the previous line (13 bits)
The printer cannot support the APT and HRC function in the 1200 dpi printing mode.
Содержание HL-1250
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Страница 21: ...2001 10 02 CHAPTER 2 PCL 1 CHAPTER 2 PCL PRINTER CONTROL LANGUAGE ...
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Страница 131: ...2001 10 02 CHAPTER 3 PCL5C 1 CHAPTER 3 PCL5C ...
Страница 149: ...2001 10 02 CHAPTER 4 HP GL 2 1 CHAPTER 4 HP GL 2 GRAPHICS LANGUAGE ...
Страница 185: ...2001 10 02 CHAPTER 4 HP GL 2 37 150 LPRINT TR0 PA3900 4900 PM0 PA5100 4900 4500 6100 PM1 160 LPRINT PM2 FP ...
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Страница 204: ...2001 10 02 CHAPTER 4 HP GL 2 56 ...
Страница 205: ...2001 10 02 CHAPTER 5 PJL 1 CHAPTER 5 PJL PRINTER JOB LANGUAGE ...
Страница 232: ...2001 10 02 CHAPTER 5 PJL 28 AUTOLF Sets AUTO LF ON or OFF AUTOMASK Sets AUTO MASK ON or OFF SELREADOUT ON or OFF ...
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Страница 264: ...2001 10 02 CHAPTER 6 EPSON 1 CHAPTER 6 EPSON FX 850 ...
Страница 286: ...2001 10 02 CHAPTER 6 EPSON 23 LPRINT CHR 27 CHR 37 CHR 1 CHR 0 Select downloaded characters ...
Страница 290: ...2001 10 02 CHAPTER 6 EPSON 27 Sample 12 ...
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Страница 294: ...2001 10 02 CHAPTER 7 IBM PROPRINTER 1 CHAPTER 7 IBM PROPRINTER XL ...
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Страница 316: ...2001 10 02 CHAPTER 8 BAR CODE CONTROL 1 CHAPTER 8 BAR CODE CONTROL ...
Страница 326: ...2001 10 02 CHAPTER 9 HP GL 1 CHAPTER 9 HP GL GRAPHICS LANGUAGE ...
Страница 353: ...10 5 2001 APPENDIX A COMPARISON LIST 1 APPENDIX A COMPARISON LIST ...
Страница 391: ...10 5 2001 APPENDIX A COMPARISON LIST 39 AUTOSKIP ON OFF ON OFF ON OFF ON OFF ...
Страница 413: ...2001 10 02 APPENDIX C HBP MODE COMMANDS 1 APPENDIX C HBP MODE COMMANDS For HL 820 1020 1040 Only ...
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