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 <amommendes@hotmail.com>

> 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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