Le 25.10.2005 14:59, Marc Schwartz a écrit : >If you specifically need the plot to have a dimension measured in >pixels, then you need to use a bitmapped format such as png and specify >the output to be the size you require: > > png("test.png", width = 300, height = 300, ...) > DoYourPlotHere() > dev.off() > >Do this directly using the png() device, rather than trying to convert >the image format, which almost always introduces "noise". > >Since you are using a bitmapped format, you will experience the tradeoff >with respect to the image quality (ie. pixelated) as compared to a >vector based format such as PDF or PS. > >I would re-verify the requirements for the journal to which you are >submitting the article relative to what they need for image specs. It >seems unusual for a journal to request an image in this fashion, unless >it is a photograph where a jpg format may be preferred or perhaps for >online publication on a web page. > >HTH, > >Marc Schwartz > > Hi folks,
I just would like to highlight the argument 'pointsize' of the png function. For graphics in RGG i use pointsize=4 and i'm happy with it. Romain >On Tue, 2005-10-25 at 08:57 +0200, Dr. med. Peter Robinson wrote: > > >>Thanks Marc and Jim for the tips. The PDF file that I create with R looks >>about the same as the one you created. However, I need to get the graphic >>to be a certain size (300 pixels wide). I have been using the ImageMagick >>program to do so for other graphics: >> >>convert test.pdf -resize 300x300 out.pdf >> >>then out.pdf looks rather poor (pixelly). The original image is too big. >>ANy ideas? >>Thanks a lot,Peter >> >> >>Am Mo, 24.10.2005, 22:53, schrieb Marc Schwartz (via MN): >> >> >>>On Mon, 2005-10-24 at 22:32 +0200, Dr. med. Peter Robinson wrote: >>> >>> >>> >>>>Dear List, >>>> >>>> >>>>I am sorry if this perhaps a too basic question, but I have not found >>>>an answer in Google or in the R help system. I am trying to use R to do >>>>a very simple analysis of some data (RT-PCR and Western analysis) with a >>>> T-test and >>>>to plot the results as a histogram with error bars. (I have pasted an >>>>example script at the bottom of this mail). In order to use this for >>>>publication, I would like to adjust the resolution and size of the final >>>>image. However, even using file types such as postscript or pdf that are >>>>vector based, I get rather bad-looking results with >>>> >>>> >>>>>pdf(file="test.pdf") source("script at bottom of mail") dev.off() >>>>> >>>>> >>>>using either pdf or postscript or jpg devices. >>>> >>>> >>>>Therefore I would like to ask the list, how to best produce a graphic >>>>from the script below that would fit into one column of a published >>>>article and have a high resolution (as eps, or failing that tiff or >>>>png)? Thanks in advance for any advice, >>>> >>>> >>>>Peter >>>> >>>> >>>> >>><Snip of code> >>> >>> >>>What OS are you on? >>> >>> >>>Running your example on FC4, I get the attached output for a pdf(). >>> >>> >>>I suspect that on your OS, the height and width arguments are not >>>appropriate by default. >>> >>>Thus, you may need to adjust your pdf (or postscript) function call to >>>explicitly specify larger height and width arguments. >>> >>>Also note that to generate an EPS file, pay attention to the details >>>section of ?postscript, taking note of the 'onefile', 'horizontal' and >>>'paper' arguments and settings. >>> >>> >>>Also, check with your journal to see if they specify dimensions for such >>>graphics so that you can abide by their specs if provided. If they are >>>using LaTeX, there are means of specifying and/or adjusting the height >>>and/or width specs in the code based upon proportions of various measures >>>(ie. \includegraphics[width=0.9\textwidth]{GraphicsFile.eps} ). >>> >>> >>>HTH, >>> >>> >>>Marc Schwartz >>> >>> -- visit the R Graph Gallery : http://addictedtor.free.fr/graphiques +---------------------------------------------------------------+ | Romain FRANCOIS - http://francoisromain.free.fr | | Doctorant INRIA Futurs / EDF | +---------------------------------------------------------------+ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html