SGI RGB file format

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Hi, I am trying to convert an Iris RGB (the ones that you can display by double
clicking on it in the workspace or using ipaste) file to another file format,
but I don't know what format the RGB file is in.  So any information on that
file format is welcome.  Thanks.

-Ching Tai
-email ching at uxh.cso.uiuc.edu
-OR ching-tai at uiuc.edu
-OR just reply to this posting.
Thank you.