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From: jal@acc (John Lauro)
Newsgroups: comp.lang.c
Subject: Re: How to reverse bits...
Message-ID: <1990Aug14.233308.27889@caen.engin.umich.edu>
Date: 14 Aug 90 23:33:08 GMT
References: <2059@ux.acs.umn.edu> <1990Aug14.203212.16248@motcad.portal.com>
Sender: news@caen.engin.umich.edu (CAEN Netnews)
Organization: University of Michigan - Flint
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In article <1990Aug14.203212.16248@motcad.portal.com> jtc@motcad.portal.com (J.T. Conklin) writes:
>Another useful table is one that flips the bits 1-for-0,0-for-1.  This
>is useful for inverting an image.

How about:   (assuming 8 bit char c) 
   c=255-c;  or
   c^=255;

    - John_Lauro@ub.cc.umich.edu