Tom,

Thanks for the further clarification, and the extra bits of code  
which are a useful addition.

Graham





On 1 May 2008, at 03:14, Mulholland, Tom wrote:

> # Rogers suggestion was
>
> library(RColorBrewer)
> bl5 <- brewer.pal(5, "Blues")
> mypal <- colorRampPalette(bl5)
>
> # but he was saying any method of getting a list of colours is OK
> rev(mypal(256))
> rainbow(256)
> colorRampPalette(c("lightblue","navy"))(256)
>
> # then your example
>        library(spatstat)
>        data(longleaf)
>        Z <- smooth.ppp(longleaf)
>        par(mfrow = c(2,2))
>        plot(Z)
>        plot(Z, col=rev(mypal(256)))
>        plot(Z, col = colorRampPalette(c("lightblue","navy"))(256))
>        plot(Z, col = rainbow(256))
>
> When Roger noted they were hard-coded he meant that the function
> topo.colors and others are standard. Adrian was just pointing out that
> his function is not hard coded to those functions and that you can use
> any other function.
>
> Tom
>
> -----Original Message-----
> From: r-sig-geo-bounces@stat.math.ethz.ch
> [mailto:r-sig-geo-bounces@stat.math.ethz.ch] On Behalf Of Graham Smith
> Sent: Wednesday, 30 April 2008 3:00 AM
> To: r-sig-geo@stat.math.ethz.ch
> Subject: Re: [R-sig-Geo] Changing colour gradient in Spatstat surface
> plot
>
> Adrian
>
> Thanks for the reply
>
>> Here is an example of the whole process, starting from a marked point
>> pattern and finishing with a colour image:
>>
>>       library(spatstat)
>>       data(longleaf)
>>       Z <- smooth.ppp(longleaf)
>>       plot(Z)
>>       plot(Z, col=topo.colors(256))
>
> This is what I did, but I couldn't find, and still can't find,
> anything in the help for plot.im or topo,colors that explains how to
> change the colours to graduated blue, am  being really dim here.
>
> However, in another post it was suggested I use rColorbrewer to set up
> the colours , but it worries me that I cannot find the bit in the help
> you have sent me to.
>
> Graham
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>
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