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H2B - Importing 8 Bit Hexidecimal

The issue of converting 8 bit hexidecimal may seem to be one that would not come up very often. However 8 bit hex is a common format for bitmapped images (grayscale PostScript) and if you wish to take a scanned image and turn it into floats for further processing, then it will come up.3.1

If you have a scanned image, written as a 256 level grayscale bitmapped PostScript image, then the bitmap portion is in 8 bit hex. By removing all of the PostScript commands, and leaving only the bitmap then the command

% h2b < hexdata > floatdata
will convert the bitmap into a form that can be viewed and processed by programs in the CWP/SU package.

John Stockwell 2007-04-10