[R] create a color palette with custom ranges between colors

[Pascal Oettli]

Hello

Package 'RColorBrewer' + function 'colorRampPalette'

or

?two.colors

HTH
Pascal


Le 12/12/12 21:00, jeff6868 a écrit :
> 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!
>
>
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>
>
>
>
> --
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>
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