Re: [R] resolution (dpi) problem

From: Ted Harding <Ted.Harding_at_manchester.ac.uk>
Date: Sat, 26 Apr 2008 23:22:39 +0100 (BST)


On 26-Apr-08 19:30:35, Chris Walker wrote:
> I am using R 2.4.1 with Windows XP.
>
> I use the plot command in a fairly simple script and I use
> the right mouse click on the plot and save as a postscript
> file. I used the resultant file in a paper which was submitted
> electronically. However, I get the following response from the
> journal:
>
> Your manuscript has been unsubmitted because you failed to meet
> the submission guidelines as indicated below:
>
> -Your figures must be submitted in TIFF or EPS format according
> to the following minimum resolutions:
>
> 1200 dpi for black and white line art (simple bar graphs, charts,
> etc.) 300dpi for halftones (black and white photographs) 600dpi
> for combination halftones (Photographs that also contain line art
> such as labeling or thin lines)
>
> Does anyone know how to produce the correct settings for the
> journal (i.e.1200 dpi)?
>
> Thankyou
> Chris W

I'm about to swim in (for me) murky waters here, since I don't use R on Windows, so things may happen on that platform which I'm not aware of.

But I just want to make general comments about PostScript and R.

  1. R's postscript() device produces EPS, so that bit should be satisfied.
  2. Normally, except when a graphic has been converted from a bit-mapped format, a PostScript (or EPS) file does not have any intrinsic resolution, so long as what it represents is vector graphics (which includes the rendering of letters, numerals, symbols, etc.). Any resolution applying to the result when a PS/EPS file is displayed/printed depends on the resolution of the "end device" (screen/printer etc.) which does the rendering. In principle, PS/EPS has "infinite" resolution (for instance, printing from EPS to photograpic film using a laser beam could have resolution as fine as 100,000).
  3. It is of course possible that the software generating the graphic implements certain things as bit-maps in the first place, in which case what goes in the PS/EPS file will inevitably do the same.

You do not say what sort of graphic you have plotted, so one cannot tell whether (3) applies. However, my feeling is that either the journal has got the wrong impression of what you sent them, or what was intended to be an EPS file in fact got created/converted to some other (bit-mapped) format before you extracted it and sent it off.

Sorry not to be more specifically helpful, but I especially wanted to make points (1) and (2) above, for clarification.

Best wishes,
Ted.



E-Mail: (Ted Harding) <Ted.Harding_at_manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861
Date: 26-Apr-08                                       Time: 23:22:36
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