R devel - Jul 2013 - Adding text comments to graphics device output files?

Hi,

several image file format supports textual/meta data comments in one
way or the other.  For me an obvious usage would be to add
sessionInfo() information to PNG and PDF image files, ideally from
within R although external tools would work as well(*).  Has anyone
looked into this or have any suggestions or comments?

/Henrik

(*) One could even imagine including self-contained R
scripts/vignettes within such comments.

Hi Henrik

 I have some extensions of Simon U's png package
to read and write metadata elements for PNG.
They are at
   https://github.com/duncantl/png.git

When I have time to completely test them, maybe Simon
may incorporate them.

  D.

On 7/30/13 7:59 PM, Henrik Bengtsson wrote:
> Hi,
> 
> several image file format supports textual/meta data comments in one
> way or the other.  For me an obvious usage would be to add
> sessionInfo() information to PNG and PDF image files, ideally from
> within R although external tools would work as well(*).  Has anyone
> looked into this or have any suggestions or comments?
> 
> /Henrik
> 
> (*) One could even imagine including self-contained R
> scripts/vignettes within such comments.
> 
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