PCL
2-61
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 2-36: 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
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