[R] image() generates many border lines in pdf, not on screen (quartz) - R 2.9.1 GUI 1.28 Tiger build 32-bit (5444) - OS X 10.5.8

[Uwe Ligges]

Stefan Evert wrote:
> 
> On 23 Aug 2009, at 20:26, Uwe Ligges wrote:
> 
>> Since it looks like nobody answered so far:
>>
>> Your code is not reproducible, we do not have rfc, y, zVals nor NoCols.
> 
> It's much easier to reproduce: just type in the first example from the 
> "image" help page
> 
>     x <- y <- seq(-4*pi, 4*pi, len=27)
>     r <- sqrt(outer(x^2, y^2, "+"))
>     image(z = z <- cos(r^2)*exp(-r/6), col=gray((0:32)/32))
> 
> then save from the quartz() display 


Well, not possible for me on Windows .....

Anyway, please use the pdf() device directly and see if it works:

pdf("path/to/file.pdf")
    x <- y <- seq(-4*pi, 4*pi, len=27)
    r <- sqrt(outer(x^2, y^2, "+"))
    image(z = z <- cos(r^2)*exp(-r/6), col=gray((0:32)/32))
dev.off()





> (I used the menu) and view with 
> Adobe Reader 9 (I seem to have 9.0.0).  

You should upgrade (even just for security reasons and many bugfixes), 
9.1.3 is recent on Windows.

Uwe Ligges



> Instead of the fine white lines 
> you always get with Preview.app and other inaccurate PDF renderers, 
> there are now huge gaps between the pixels (around 1/10th of pixel width).
> 
> This is very probably a bug in the Quartz device (or Quartz itself), as 
> the lines go away if you save the plot with dev.copy2pdf(), which I 
> normally use.
> 
> @OP: Do you have any particular reason for using quartz.save() or the 
> menu item instead of dev.copy2pdf()?
> 
>> You could also try to place a screenshot somewhere on a webpage 
>> including the info about the settings of the corresponding viewer.
> 
> I've tried switching off _all_ of the numerous anti-aliasing options of 
> Adobe Reader 9; absolutely no difference.
> 
> Hope this helps,
> Stefan
> 
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