From p.murrell at auckland.ac.nz  Sun Feb 15 20:48:38 2009
From: p.murrell at auckland.ac.nz (Paul Murrell)
Date: Mon, 16 Feb 2009 08:48:38 +1300
Subject: [Rd] Identifying graphics files produced by R
In-Reply-To: <475a3c8f0902131315q3291de31vdd43ad92bb213cb9@mail.gmail.com>
References: <475a3c8f0902131315q3291de31vdd43ad92bb213cb9@mail.gmail.com>
Message-ID: <49987196.9050902@stat.auckland.ac.nz>

Hi


David M Smith 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 know that pdf() adds similar "Creator" information.  I don't recall
seeing anything like this for the raster devices, but I've worked less
with them so I don't know for sure.

Paul


> 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 at revolution-computing.com>
> Director of Community, REvolution Computing www.revolution-computing.com
> Tel: +1 (206) 577-4778 x3203 (Seattle, USA)
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/



[Rd] Identifying graphics files produced by R
Paul Murrell