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 > <dtemplel...@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. >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel >>> >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
