[R] 300 dpi and eps:

[Jeff Newmiller]

It is possible to embed a raster image inside eps, but AFAIK R does not do this. Other than that, your questions do not apply to eps. Rendering resolution only comes into play when you put it into a raster software (like photoshop) or print it.

Beyond that, we don't know what you are doing with the file after R generates it, and this is not a digital publishing mailing list so this isn't the right forum to continue this discussion.

"Aldi Kraja" <aldi at wustl.edu> wrote:

>I have come around several times from R to A. Illustrator, or A. 
>photoshop, and between them with PowerPoint. It is possible that the 
>last one I reported was from PowerPoint.
>So from your postings it was made clear that postscript plot from R 
>produces a vector graph.
>
>Can someone recommend some paper that makes clear the relation and 
>distinctions between vector and raster graphics, but especially with 
>some practical examples in regard to what is the relation between page 
>(height and width) and dpi.
>
>For example if I plan to print high resolution graph in an image size
>of 
>the A4 paper (8.5 inch x 11 inch) and from a journal it is required
>that 
>the graph needs to have 300 dpi or more how one tells to the R
>graphical 
>device to produce this setting?
>
>In A. photoshop for example I can define for a graph width in inches, 
>height in inches and resolution in pixels/inch color model CMYK and 8 
>bit. How one works in R?
>
>Or one saves the graph from postscript function as eps or tiff and you 
>tell to the editor of the journal do whatever you want because I am 
>done; I provided you already a vector graph that has infinite
>pixels?:-)
>
>Thank you advance,
>
>Aldi
>
>On 12/15/2010 3:52 AM, Rainer M Krug wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
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>> On 12/15/2010 09:31 AM, Philipp Pagel wrote:
>>>> Everything works fine to place them in a pdf file , or eps file,
>but
>>>> when it comes to have a high quality of 300 dpi these graphs are
>not
>>>> good. For example I open the eps file with Adobe Illustrator (AI)
>>>> and it shows that it is a 72dpi graph.
>>> This is simply not true: it's an eps and thus of essentually
>infinite
>>> resolution for all practial purposes.
>> Just to clarify this: eps / ps are vector formats - i.e. it says in
>the
>> file "draw a line from point x to point y". In contrast, bmp (and
>e.g.
>> jpg, png, tiff) are raster formats: in these formats save the PICTURE
>of
>> the line from point x to y.
>> Consequently, only raster formats have dpi ("dots" per inch).
>>
>>> So your problem is not with
>>> the R-generated eps but somewhere downstream from that. Any
>>> postprocessing, conversion or editing?
>> Or in Adobe illustrator? It strikes me, that 72dpi is usually the
>screen
>> resolution.
>>
>> Cheers,
>>
>> Rainer
>>
>>> cu
>>> 	Philipp
>>>
>>
>> - -- 
>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
>> Biology, UCT), Dipl. Phys. (Germany)
>>
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