Lexmark XS795 Printer Languages and Interfaces Technical Reference - Page 37

Adaptive compression, Adaptive compression control strings

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Printer Control Language (PCL) emulation 37 Example: ESC*p300x1200Y ESC*b3M ESC*r1A ESC*b9W 'E0FFFFFFFFFFFFFFFF'x ESC*b9W 'E08000000000000001'x ESC*b0W ... ESC*b0W ESC*b9W 'E0FFFFFFFFFFFFFFFF'x ESC*rB |Move cursor to 1 x 4 in. |Set compression to Delta Row |Start raster graphics at current position |Num Offset |'111 00000'b=8 at 0: 'FFFFFFFFFFFFFFFF'x |8 at 0: '8000000000000001'x |No bytes change |No bytes change |8 at 0: '8FFFFFFFFFFFFFF'x |End graphics Adaptive compression Adaptive compression allows the combined use of compression methods 0 through 3 (Uncoded, run-length encoded, TIFF, and delta row). It also allows the printing of empty rows (all zeros) or duplicate rows. • The Transfer Raster Data command size includes all rows (scan lines). • Scan Mode and SizeH,L are three-byte primary control strings: CountH and CountL. Adaptive compression control strings Scan mode CountH, CountL 0 Data SizeH,L 1 Data SizeH,L 2 Data SizeH,L 3 Data SizeH,L 4 NumberH,L of empty rows 5 NumberH,L of duplicate rows 254 Data SizeH,L 255 Data SizeH,L Example: Data Uncoded raster scan data Size of run-length encoded data (high,low) Size of Tagged Image File Format (TIFF) data (high,low) Size of delta row data (high,low) None None TIFF word TIFF double-word ESC*p300x1500Y ESC*b5M ESC*b29W '03 0009'x 'E0FFFFFFFFFFFFFFFF'x '01 0006'x '0080 FB00 0001'x '05 0035'x |Move cursor to 1 x 5 in. |Set the compression to adaptive compression |Raster Data: 29 bytes follow |Delta Row: 8 at 0: 'FFFFFFFFFFFFFFFFh'x |Run Length: 1:'80'x, 6x'00'x, 1:'01'x |Duplicate rows: 61 times

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ESC
*p300x1200Y
|Move cursor to 1 x 4 in.
ESC
*b3M
|Set compression to Delta Row
ESC
*r1A
|Start raster graphics at current position
|Num Offset
ESC
*b9W 'E0FFFFFFFFFFFFFFFF'x
|'111 00000'b=8 at 0: 'FFFFFFFFFFFFFFFF'x
ESC
*b9W 'E08000000000000001'x
|8 at 0: '8000000000000001'x
ESC
*b0W
|No bytes change
...
ESC
*b0W
|No bytes change
ESC
*b9W 'E0FFFFFFFFFFFFFFFF'x
|8 at 0: '8FFFFFFFFFFFFFF'x
ESC
*rB
|End graphics
Adaptive compression
Adaptive compression allows the combined use of compression methods 0 through 3 (Uncoded, run-length
encoded, TIFF, and delta row). It also allows the printing of empty rows (all zeros) or duplicate rows.
•
The Transfer Raster Data command size includes all rows (scan lines).
•
Scan Mode and SizeH,L are three-byte primary control strings: CountH and CountL.
Adaptive compression control strings
Scan mode
CountH, CountL
Data
0
Data SizeH,L
Uncoded raster scan data
1
Data SizeH,L
Size of run-length encoded data (high,low)
2
Data SizeH,L
Size of Tagged Image File Format (TIFF) data (high,low)
3
Data SizeH,L
Size of delta row data (high,low)
4
NumberH,L of empty rows
None
5
NumberH,L of duplicate rows
None
254
Data SizeH,L
TIFF word
255
Data SizeH,L
TIFF double-word
Example:
ESC
*p300x1500Y
|Move cursor to 1 x 5 in.
ESC
*b5M
|Set the compression to adaptive compression
ESC
*b29W
|Raster Data: 29 bytes follow
'03 0009'x 'E0FFFFFFFFFFFFFFFF'x
|Delta Row: 8 at 0: 'FFFFFFFFFFFFFFFFh'x
'01 0006'x '0080 FB00 0001'x
|Run Length: 1:'80'x, 6x'00'x, 1:'01'x
'05 0035'x
|Duplicate rows: 61 times
Printer Control Language (PCL) emulation
37
Example: