Lexmark C760, C762 manual 2-62, Run-Length Encoded Data, Tagged Image File Format, Example

Models: C762 C760

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2-62

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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

Page 74
Image 74
Lexmark C760, C762 manual 2-62, Run-Length Encoded Data, Tagged Image File Format, Example