Lexmark Printer manual Adaptive Compression Control Strings, Scan Mode CountH,CountL Data

2-92 PCL

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.

Table 2-50: 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	None
	rows
5	NumberH,L of duplicate	None
	rows
254	Data SizeH,L	TIFF word
255	Data SizeH,L	TIFF double-word

Example:

ESC*p300x1500Y	Move cursor to 1" x 5"
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
'02 0002'x 'F9FF 'x	TIFF: 8x'FF'x
ESC*rB	End graphics