[Rd] Adding text comments to graphics device output files?
hb at biostat.ucsf.edu
Thu Aug 1 19:26:56 CEST 2013
Thank you both. It works like a charm (tried it on Windows).
On Wed, Jul 31, 2013 at 7:17 AM, Simon Urbanek
<simon.urbanek at r-project.org> wrote:
> On Jul 31, 2013, at 12:12 AM, Henrik Bengtsson wrote:
>> Hi Duncan,
>> this is perfect timing. Your
>> https://github.com/duncantl/png/blob/master/testMeta.R example
>> illustrates what I'm looking for.
>> Yes, it would be great if this would be incorporated into the 'png' package.
> Ok, I have added support for both text chunks and arbitrary R metadata to the PNG package.
> The it is based on Duncan's idea, but the implementation and API is different -- Duncan's approach was implemented before png has support for the PNG info, so it is now simply extending that concept. You can store native text key/values pairs. In addition, R-native matadata can be attached -- it is stored as a special key "R.metadata" holding the serialization of the R object. See the last example in
> Feedback is welcome.
>> On Tue, Jul 30, 2013 at 8:04 PM, Duncan Temple Lang
>> <dtemplelang at ucdavis.edu> wrote:
>>> Hi Henrik
>>> I have some extensions of Simon U's png package
>>> to read and write metadata elements for PNG.
>>> They are at
>>> When I have time to completely test them, maybe Simon
>>> may incorporate them.
>>> On 7/30/13 7:59 PM, Henrik Bengtsson wrote:
>>>> 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?
>>>> (*) One could even imagine including self-contained R
>>>> scripts/vignettes within such comments.
>>>> R-devel at r-project.org mailing list
>>> R-devel at r-project.org mailing list
>> R-devel at r-project.org mailing list
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