Dear Chris, That problem is due to the fact that ggsave() and png() use different default for the resolution. ggsave() uses 300 dpi and png() 72 dpi. If you set the resolution in ggsave() to 72 then you get exactly the same output as on the screen. But the resolution is way to low for publication. I have the feeling that everything scales rather nice when using a different resolution, except for the fonts.
My workaround is to always save my plots to pdf. I use them as pdf (no problem with that in LaTeX), unless the figure contains lots of points (e.g. scatterplots). In that case I convert the pdf to png outside R. The best tools I found for that are Ghostfriend (http://www.noliturbare.com/index.php) and www.zamzar.com. HTH, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 thierry.onkel...@inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Namens Dieter Menne Verzonden: donderdag 20 augustus 2009 9:13 Aan: r-help@r-project.org Onderwerp: Re: [R] ggsave to .png bug in ggplot2 (?) Chris Friedl wrote: > > Text is really small and legend boxes are huge in this plot when saved > to .png with ggsave. Plot is correct (i.e. looks the same as the > screen) when saved with dev.print. Saving to .pdf with ggsave give the correct output. > > You are not alone. Things like this always happen the day before the deadline, when you want to make minor changes. It is not limited to ggplot, but looking at the variant require(ggplot2) x <- data.frame(value=rnorm(5000, mean=0), case="A") y <- data.frame(value=rnorm(5000, mean=3), case="B") xy <- rbind(x, y) p <- ggplot(xy, aes(x=value, colour=case, group=case)) + geom_density() p ggsave(p, width=4,height=4,filename = "xy_ggsave.png") makes me believe that this function should be banned. You might also check the output of the ggsave documentation page to learn what scaling means in R. (Slightly modified below). ratings <- qplot(rating, data=movies, geom="histogram") qplot(length, data=movies, geom="histogram") ggsave(file="length-hist.pdf") ggsave(file="length-hist.png") ggsave(ratings, file="ratingsA.pdf") ggsave(ratings, file="ratingsB.pdf", width=4, height=4) # make twice as big as on screen ggsave(ratings, file="ratingsC.pdf", scale=2) I never use these functions in final production, be it in standard graphics or lattice, but always open a device and close it after all plots have been produced. Dieter -- View this message in context: http://www.nabble.com/ggsave-to-.png-bug-in-ggplot2-%28-%29-tp25055170p2 5057074.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org 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. Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ R-help@r-project.org 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.
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