Iris Image Lab format

[rbriber at POLY1.NIST.GOV]

We've used the tools in /usr/people/4Dgifts/iristools/imgtools quite a bit to 
work with images.  We've also used the example code to write image conversion
programs for our own image format -> iris format.  The code examples are 
really useful, still I find it quite odd that SGI doesn't document the 
image file format officially, after all they do ship a significant number
of .rgb and .bw images with the demo stuff.  I can understand not supporting
the code in the 4Dgifts directory but the image file format seems really
basic in many ways.



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