Darren New wrote:
> If you use the textual version of PPM, you can open it in a text editor 

convert xyz.png -compress None xyz.ppm

Then edit xyz.ppm in a text editor. You'll get a header (P3), the X, Y, and 
maximum data value, then X*Y ascii integers.

Read em, average em, convert em back.

-- 
Darren New, San Diego CA, USA (PST)
    C# - a language whose greatest drawback
    is that its best implementation comes
    from a company that doesn't hate Microsoft.

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