On 6/15/07, Ted Harding <[EMAIL PROTECTED]> wrote: > Hi Folks, > > This is off-topic R-wise, but it may be close to > the heart of many R-users, so I think it may be > the best place to ask! > > Users of 'gv' (the "front end" to ghostscript) will > be aware of the little window which gives you the > x-y coordinates (in points = 1/72 inch) of the position > of the "cross-hair" mouse cursor. These coordinates > are those of the corresponding position on the printed > page, relative to some origin. > > I have often used this to extract numerical values > for data from graphs in Postscript files (also PDF > files, after you have converted them to PS). Then > (veering back on topic ... ) you can submit the > numerical data to R and try your own analyses on > these data, and compare with what the article does. > > However, this little window only gives the numbers > in whole points. Say a smallish graphic may print > out 3 inches wide or high. Then you get precision > of 1/216 per 3 inches or 0.4% of full scale. This > can be adequate on many occasions, but can be on > the coarse side on other occasions.
If you are mostly concerned about small figures, one possibility is 1. zoom out to a level where you're happy with the pixel resolution 2. do a screen capture using 'import' 3. use gimp (which has the same feature, with more units) gimp can also load PS files directly, with a user supplied zoom factor at load time, but only one page at a time, AFAICT. -Deepayan ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
