[R] lattice grayscale "theme"

[Deepayan Sarkar]

On 7/30/07, Patrick Drechsler <patrick at pdrechsler.de> wrote:
> "Deepayan Sarkar" <deepayan.sarkar at gmail.com> writes:
> > On 7/30/07, Patrick Drechsler <patrick at pdrechsler.de> wrote:
> >> The Gmane interface seems to have some lag at the moment...
> >>
> >> "Deepayan Sarkar" <deepayan.sarkar at gmail.com> writes:
> >>
> >> > On 7/28/07, Patrick Drechsler <patrick at pdrechsler.de> wrote:
> >> >>
> >> >> is there a grayscale setting for lattice plots?
> [...]
> >> >> Is there a simple way of achieving something in between these
> >> >> settings (using grayscales for the default colors)?
> >> >
> >> > Possibly, but you would have to define what you mean by 'simple'
> >> > and 'something in between' more precisely.
> >>
> >> Here is an example of 'in between':
> >>
> >> --8<---------------cut here---------------start------------->8---
> >>   ## Set background color of strips to grayscales:
> >>   strip.background <- trellis.par.get("strip.background")
> >>   trellis.par.set(strip.background = list(col = grey(7:1/8)))
> >>   ## Set color of plot symbols to grayscale:
> >>   plot.symbol <- trellis.par.get("plot.symbol")
> >>   trellis.par.set(plot.symbol = list(col = grey(5/8)))
> >> --8<---------------cut here---------------end--------------->8---
> >
> > Well, there you go. You have a new theme.
>
> Thanks for confirming that I am on the right track!
>
> >> I think it would be nice to have a few default "themes": A single
> >> switch between "default color", "grayscale" and "black and white".
> >
> > I'm still not sure what qualities you are looking for in the new
> > theme.
>
> Goal:
>
> Lattice should have good default settings for color, grayscale and
> b&w.
>
> The user should not be bothered with the details (similar to using
> LaTeX: Many users do not have any idea of DEK's typesetting in the
> background).
>
> Lattice functions should provide reasonable default settings.
>
> The default colors for the lattice suite were chosen for a reason
> (very good choice for color display).
>
> IMO the default grayscale colors should be wrapped into a similar
> default-suite after discussion of which grayscales are best suited for
> printing with different common resolutions using b/w printers.
>
> After this has been decided upon, it might be nice to have something
> along the lines of:
>
> lattice.options(default.theme = [color|gray|bw])
>
> Have I described my concern elaborately enough?

Yes, and I agree that in principle it would be a good thing to have.
Personally, I don't believe such a theme can be made (at least not one
that's generally useful) and will not spend time trying to create one.
I'm happy to add one to lattice if anyone contributes it.

-Deepayan