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Graphics Compresion Mode 2 in PCL-3

Graphics Compresion Mode 2 in PCL-3

Graphics Compresion Mode 2 in PCL-3

I need information, about of raster graphics compression mode 2, in pcl-3 command mode. I have one image very longer.


RE: Graphics Compresion Mode 2 in PCL-3

Graphics Mode 2
This mode is concerned with both repeating bytes and conventional non-repeating bytes.  The data bytes occur in groups of variable length.  The first byte of a group indicates whether a repeated byte or a series of unrepeated bytes follow.  If the first byte has a value from [00] to [7F] then it indicates a number of unrepeated bytes follow.  A value of [00] represents one unrepeated byte, and a value of [7F] represents 128 unrepeated bytes.  If the first byte has a value from [80] to [FF] then it indicates a repetition of the following byte.  A value of [FF] represents one repetition (two occurrences), and a value of [80] represents 128 repetitions.  If you wanted to print a pattern represented by the following thirteen data bytes in mode 0: [FF][FF][FF][FF][00][18][00][FF][FF][FF][FF] you could compress this data in mode 2 to just eight bytes: [FC][FF][02][00][18][00][FC][FF].


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