Thanks to all those that responded to the question below, either on-list or
privately.  The bottom line is that there's no identifying information from
R in the metadata for PNG or JPG files (and R doesn't produce GIFs). I did
however figure out a way to automate a search for PDF and PostScript files
produced by R, and the details are here:
http://blog.revolution-computing.com/2009/02/r-graphics-in-the-media.html

Thanks,
# David Smith

On Fri, Feb 13, 2009 at 1:15 PM, David M Smith <
david@revolution-computing.com> wrote:

> Oftentimes, I see graphs on the web that *look* like they've been
> produced by R, but I can never be sure.  Or can I?  I notice that
> PostScript files include a "%%%Creator: R Software" line, but do R
> graphics drivers encode any identifying information in GIF or PNG
> files more commonly used on the web?  And of so, would such evidence
> necessarily be obliterated in post-processing (e.g cropping)?
>
> I'm trying to do an informal survey of R's use to create statistical
> graphics on the web, and if there's a way to identify graph files I
> see as coming from R it would help a lot.
>
> Thanks,
> # David Smith
>
> --
> David M Smith <david@revolution-computing.com>
> Director of Community, REvolution Computing www.revolution-computing.com
> Tel: +1 (206) 577-4778 x3203 (Seattle, USA)
>



-- 
David M Smith <david@revolution-computing.com>
Director of Community, REvolution Computing www.revolution-computing.com
Tel: +1 (206) 577-4778 x3203 (Seattle, USA)

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