On Fri, Jun 6, 2008 at 6:23 PM, Achim Zeileis
<[EMAIL PROTECTED]> wrote:
> On Fri, 6 Jun 2008, Michael Friendly wrote:
>
>> In an R graphic, I'm using
>>
>> cond.col <- c("green", "yellow", "red")
>> to represent a quantitative variable, where green means 'OK', yellow
>> represents 'warning'
>> and red represents 'danger'. Using these particular color names, in B/W,
>> red is darkest
>> and yellow is lightest. I'd like to find color designations to replace
>> yellow and green so
>> that when printed in B/W, the yellowish color appears darker than the
>> greenish one.
>>
>> Is there some tool/code I can use to find these? i.e., something to
>> display a grid
>> of color swatches with color codes/names I can look at in color and B/W to
>> decide?
>
> You could look at colors in HCL (i.e., polar LUV). For example, you could
> choose a dark red HCL = (0, 90, 40) and a light green (120, 70, 90) and a
> yellow somewhere in between.
How did you get to those numbers? I seem to remember there being
someway to convert rgb to hcl, but I can't find it.
Hadley
--
http://had.co.nz/
______________________________________________
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.
