[Rd] [R] color palette from red to blue passing white (shifted from R-help)
p.murrell at auckland.ac.nz
Wed Dec 5 20:23:05 CET 2007
Martin Maechler wrote:
>>>>>> "Paul" == Paul Murrell <p.murrell at auckland.ac.nz>
>>>>>> on Wed, 05 Dec 2007 08:53:10 +1300 writes:
> Paul> Hi
> Paul> Achim and I have been looking at tidying up the colorspace package (see
> Paul> http://r-forge.r-project.org/projects/colorspace/) to fix a few
> Paul> inaccuracies, PLUS the possibility of declaring R's internal color space
> Paul> to be sRGB.
> Paul> I have started an RFC on the r-developer site
> Paul> (http://developer.r-project.org/sRGB-RFC.html) to discuss some possible
> Paul> changes to the core engine and add-on packages.
> Paul> One of the issues will be consolidating some of the double-ups (e.g.,
> Paul> hcl() in base and the counterpart in package 'colorspace'; I did not
> Paul> even know about convertColor()!).
> Paul> Ideally, we would have only one copy of the conversions between the
> Paul> various colorspaces (probably C code, then the various R-level front
> Paul> ends can all just run off the same internal code).
> Paul> A lot of these conversions exist now in 'colorspace', but as Thomas
> Paul> pointed out, the S4-ness of 'colorspace' is a problem for making these
> Paul> conversions part of base R.
> Hmm, I think we are currently only required to keep 'base' not
> dependent on 'methods'.
> Why should 'grDevices' or new "standard R" package not be
> dependent on 'methods' ?
> Many of us would like to see S4 been used much more widely.
Great. I will keep working on the RFC to see if I can propose a way to
reconcile all of the color-conversion and palette-selection code based
on a single sRGB representation in the R core and only one set of
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
64 9 3737599 x85392
paul at stat.auckland.ac.nz
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