HP 5961-0509 manual Set Compression Method Command, Unencoded Method, Run-length Encoding Method

Set Compression Method Command

The Set Compression Method command allows you to code raster data in one of four compressed formats: Run-length encoding, tagged imaged file format (TIFF) rev. 4.0, delta row compression, and adaptive compression. The choice of compression methods affects both the amount of code needed to generate a raster graphic image and the efficiency with which the image is printed.

EC& * b # M

# =0- Unencoded
1	- Run-length encoding
2	- Tagged Imaged File Format (TIFF) rev. 4.0
3	- Delta row compression
4	- Reserved
5	- Adaptive compression

Default	=	0
Range	=	0 - 5 (values outside the range are ignored)

	Unencoded (Method 0)
	This is a simple binary transfer of data: no compression. Each bit
	describes a single dot. Bit 7 of the first byte corresponds to the first
	dot within the raster row, bit 0 corresponds to the eighth dot, and
	so on.
Note	Compressed data formats allow for efficient transfer of data from
	the host system to the printer. However, compressed data formats
	do NOT reduce the amount of printer memory required to produce
	an image.

Run-length Encoding (Method 1)

Run-length encoding interprets raster data in pairs of bytes. The first byte of each pair is the repetition count for the data in the second byte. The second byte is the raster data to be printed.

A repetition count of 0 signifies the pattern in the data byte is not repeated (it occurs only once). A repetition count of 1 signifies the pattern occurs twice. The repetition count can range from 0 to 255 for a repetition of 1 to 256 times.

[(Repetition count byte 0-255)(pattern byte)] . [ . ] [ ]

15-16Raster Graphics EN