[R-sig-Geo] plotRGB - negative values

[amluiz]

Thanks Etienne
I was trying to plot three PCA axes (each one representing R, G and B color bands) in the map, but without success in R. I only can do this in GIS software...
Any suggestion? 

Date: Tue, 6 Aug 2013 13:51:55 -0700
From: ml-node+s2731867n7584357h83 at n2.nabble.com
To: amommendes at hotmail.com
Subject: Re: plotRGB - negative values



	Amom, you could probably offset your values and make sure you set scale to

the right value. If your lowest value is 1 and the highest value then

becomes 2, then something like

plotRGB(all.pca + 1, scale = 2)


I don't think you can use negative values in plotRGB.


Etienne



2013/8/6 amluiz <[hidden email]>


> Hello,

>

> I'm trying to use plotRGB. But I've negative values in my rasters cells and

> I get the following error:

>

> plotRGB(all.pca)

> Error in rgb(RGB[, 1], RGB[, 2], RGB[, 3], alpha = alpha, max = scale) :

>   color intensity -1, not in 0:255

>

> Is there some way to solve this?

>

> Thanks in advance,

>

> Amom

>

>

>

>

>

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