Re: [R] High resolution plots

From: Knut Krueger <admin_at_biostatistic.de>
Date: Tue 12 Jul 2005 - 20:43:13 EST

Sorry i sent the answer not to the mailing list - here it is

Brian D Ripley schrieb:

>On Tue, 12 Jul 2005, Knut Krueger wrote:
>
>
>
>>Prof Brian Ripley schrieb:
>>
>>
>>
>>>Please read carefully what `resolution' means for a png() device (and a
>>>PNG file). It is a hint to the viewer in the file header (often ignored),
>>>as described in the R help file.
>>>
>>>
>>>
>
>
>>>On Tue, 12 Jul 2005, Knut Krueger wrote:
>>>
>>>
>>>
>>>
>>>
>>>>Is there any possibility to get high resolution plots in a windows xp
>>>>system?
>>>>I tried it with the device function png(filename =
>>>>"c:/r/highresplot%d.png",pointsize=12, res=900)
>>>>but when I try to set: width = 480, height = 480 or pointsize = 12,
>>>>the text is not scaled in the same way as the plots.
>>>>
>>>>
Ok first:
I do not want anybody to get angry and I am the first time in this group. I will make any mistakes like sending you your own help file and I apologize in advance for those mistakes.

>Not if you just include those arguments or not. Yes if you include
>res=900 or not, but that is not what you said.
>
>

I tried to include res=600 and res=300 there was no difference in the file, both size was 4kb 480*480 Pixel and 150 dpi

png(filename = "c:/r/highresplot%d.png",width = 480, height =
480,pointsize=12, res=300)
png(filename = "c:/r/highresplot%d.png",width = 480, height =
480,pointsize=12, res=600)


second attempt was to increase width = 480, height = 480 to width = 960, height = 960

png(filename = "c:/r/highresplot%d.png",width = 960, height =
960,pointsize=12, res=600)
png(filename = "c:/r/highresplot%d.png",width = 480, height =
480,pointsize=12, res=300)


both is the file size 8kb either with res=300 or res=600 double file size with double size of the device that's what i expected.

The letters are nearly unreadable because they are very small - ok png(filename = "c:/r/highresplot%d.png",width = 480, height = 480,pointsize=24, res=300)
Letters are in the same size as
png(filename = "c:/r/highresplot%d.png",width = 480, height = 480,pointsize=12, res=300)
also that's what I expected, but the quality of the characters is as bad as when I would extract the plot with any graphic application and the small lines from boxplots are sometimes visible sometimes not.

>Why aer you sending me a help file I wrote, one which you seem to be
>unable to understand? I am not the one failing to notice what it says.
>

But maybe you are right that I am not understanding the help file, but I hope that clarifies my problems and my mistakes

with regards
Knut Krueger
http://www.biostatistic.de



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