PCL
2-83
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.
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
Table 2-37: 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
