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Run-Length Encoded Data
Run-Length Encoded Data is interpreted in pairs of bytes. The first byte:
• Acts as a counter, or control byte.
• Indicates how many times to repeat the data in the second byte.
• Can be from 0 (no repetition) to 255.
• The second byte is the data byte.
Example:
ESC
*p300x600Y |Move cursor to 1" x 2"
ESC
*b1M |Set compression to Run-Length
ESC
*r1A |Start raster graphics at current position
ESC
*b2W '07FF'x |Run-Length: 8x'FF'x
ESC
*b6W '0080 0500 0001'x |1x'80'x, 6x'00'x, 1x'01'x
ESC
*b6W '0080 0500 0001'x |1x'80'x, 6x'00'x, 1x'01'x
... |...
ESC
*b6W '0080 0500 0001'x |1x'80'x, 6x'00'x, 1x'01'x
ESC
*b2W '07FF'x |8x'FF'x
ESC
*rB |End graphics
Tagged Image File Format
TIFF “Packbits” contain a control byte (a signed number) that indicates whether the
raster data bytes are to be repeated (up to 127 times) or printed as encoded data.
• For control values of 0 through 127, the next (Control+1) byte(s) is uncoded.
• For control values of -1 through -127 ('FF'x - '81'x), the next byte is repeated
(Abs(Control)+1) times.
Example:
ESC
*p300x900Y |Move cursor to 1" x 3"
ESC
*b2M |Set compression to TIFF
ESC
*r1A |Start Raster Graphics at current position
ESC
*b2W 'F9FF'x | TIFF: 8x'FF'x
ESC
*b6W '0080 FB00 0001'x |1:'80'x, 6x'00'x, 1: '01'x or
ESC
*b9W '078000000000000001'x |8: '8000000000000001'x
... |...
ESC
*b6W '0080 FB00 0001'x |1:'80'x, 6x'00'x, 1: '01'x
ESC
*b2W 'F9FF'x |8x'FF'x
ESC
*rB |End graphics