2011/4/13 Matthieu Stigler <matthieu.stig...@gmail.com>: > Jim > > Thanks for your feedback! The problem is that the people "those responsible > for layout" are us... We are doing the book in Latex, and till now did not > need any other software. > > But I am scared we will need use kind of Indesign & co softwares to be able > to use our R plots, since R can't export into spotcolor...
I've just had a look into how PostScript handles spot colours, having been hacking PS files for many years its not something I'd played with before. This page gave me a PS file that used spot colours: http://pslib.sourceforge.net/examples.php and it seems that you can set a colour using a colour space array: [ /Separation (PANTONE Violet C) /DeviceCMYK { dup 0.750000 mul exch dup 0.940000 mul exch dup 0.000000 mul exch 0.000000 mul } ] setcolorspace 1.00 setcolor Now, my screen previewer has no idea what colour PANTONE Violet C is, so there's an alternative CMYK colour space version. In fact PANTONE Violet C is just a label. The idea is that when processed for colour separations the software will use the separation colours. Now, to get this into R is tricky. Either you have to rewrite the PS driver or hack the PS output file. I produced a simple R plot with one purple (col="#FF00FF") blob and saved to a PS file. The bit of the PS that set the colour was this: /bg { 1 0 1 rgb } def 1 0 1 rgb - the two settings here are for the outline and fill of the blob, which was created using pch=19. To specify this as a spot colour (with a CMYK alternative for preview), I changed that to this: /pvc { [ /Separation (PANTONE Violet C) /DeviceCMYK { dup 0.750000 mul exch dup 0.940000 mul exch dup 0.000000 mul exch 0.000000 mul } ] setcolorspace } def /bg { pvc 1.00 setcolor } def pvc 1.00 setcolor Now if you only have one or two spot colours and only a few places where they occur then it might be possible for you to do this kind of edit/replacement - either manually or automatically. And beware I'm not even sure this is right or that your publisher would be happy anyway. Anyway, thats enough PS hacking for one day. Barry ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
