[Rd] Adding text comments to graphics device output files?

[Henrik Bengtsson]

Thank you both. It works like a charm (tried it on Windows).

/Henrik

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.
> http://rforge.net/png
> 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
> http://rforge.net/doc/packages/png/writePNG.html
> Feedback is welcome.
>
> Cheers,
> Simon
>
>
>
>> Thanks,
>>
>> Henrik
>>
>> 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
>>>   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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>