From nikko at hailmail.net  Thu Dec  6 13:21:22 2007
From: nikko at hailmail.net (Nicholas Lewin-Koh)
Date: Thu, 06 Dec 2007 07:21:22 -0500
Subject: [Rd] [R] color palette from red to blue passing white (shifted
 from R-help)
Message-ID: <1196943682.4913.1225132255@webmail.messagingengine.com>

Hi,
The move to sRGB is nice, is there any interest in adding an interface
to lcms, http://www.littlecms.com,
to allow gamut matching? I can think of a lot of instances where I would
like to render a
figure as it would appear on my printer. This is probably best done as a
separate package though,
at least at first.

Nicholas


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
conversion functions.

Paul


> Martin



[Rd] [R] color palette from red to blue passing white (shifted from R-help)
Nicholas Lewin-Koh