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From: robeson@brahms.udel.edu (Scott M Robeson)
Newsgroups: comp.graphics
Subject: Re: Incredible discovery with Cshow and .gif files!!!!!!!
Summary: read the document files
Message-ID: <20280@brahms.udel.edu>
Date: 9 Apr 91 14:16:30 GMT
References: <1991Apr9.043240.27736@magnus.acs.ohio-state.edu>
Organization: University of Delaware
Lines: 12

In article <1991Apr9.043240.27736@magnus.acs.ohio-state.edu> smsmith@hpuxa.ircc.ohio-state.edu (Stephen M. Smith) writes:
...
>Now, can somebody tell me why the two different drivers
>do this?  Note: Many of my files have been converted
>from .jpg to .gif with alchemy.  Does this have anything
>to do with it?

Read the document files that come with Cshow.  In the ordinary
drivers (i.e., non-tweaked), every other line of the image is
sampled and displayed, giving that grainy appearance.  The 
document files also indicate which graphics cards are supported
and how to enable them.