rawimage.icn: Procedures to write and read images in raw format

link rawimage
May 2, 2001; Ralph E. Griswold
Requires: Version 9 graphics and co-expressions
This file is in the public domain.

These procedures write and read raw image files.  The format of a raw
image file is:

     width,height
     <palette entries with 2 hex digits, a blank, and a color specification>
     <blank line>
     <image data consisting of pairs of hext digits in row-primary order>

These procedures are slow and should only be used when the image file
formats that Icon can read and write are not sufficient.