Would this accomplish what you're trying to do?
http://www.r-bloggers.com/define-intermediate-color-steps-for-colorramppalette/

Or some combination of ?colorRampPalette and ?cut or classIntervals() from
package classInt.



On Wed, Dec 12, 2012 at 7:00 AM, jeff6868 <geoffrey_klein@etu.u-bourgogne.fr
> wrote:

> Hello everybody,
>
> I'm trying to create my own color palette on R, in order to interpolate
> some
> different temperature data on different maps (daily means, seasonal
> means,...).
>
> I would like to create a color palette which works for each map, so I need
> a
> color palette between -40 and +40°C. Sometimes my data for one map range
> from -10 to +20, sometimes from 10 to 30, etc... but always between -40 and
> +40°C.
>
> I would like a fluent color gradation between my extremas (-40 and +40),
> with different colors between customed values.
>
> For example, if the temperature is under -20°C I would like the color
> "darkblue", then if the temperature is between -20 and 0°C I would like the
> color "lightblue", then between 0 and 20°C the color "yellow" and finally
> over 20°C the color "red".
>
> Is it possible to create a fluent gradation color palette with customed
> colors (not just one color for each part, but something fluent based on the
> chosen colors) ?
> Something like this: http://i.stack.imgur.com/5NoJh.jpg
>
> I would like then to join this customed color palette to all my "levelplot"
> or "image.plot" functions,in order to create all my maps.
>
> Any help for doing this would be very much appreciated!
>
> Thanks a lot!
>
>
>
>
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/create-a-color-palette-with-custom-ranges-between-colors-tp4652875.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



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