[R-sig-Geo] image display of rgdal-imported color composite image

[Tim Keitt]

On 10/25/07, Agustin Lobo <Agustin.Lobo at ija.csic.es> wrote:
> Hi,
>
> Is image() able to display a color composite?

The displayDataset() function should use the colormap. You will need
to open with GDAL.open().

THK

>
> I've made an 8 bit color composite (with another software), saved it as
> geotif and then, in R:
>
> t1pcs <- readGDAL("G:/PERU/imorm2007/test1TNT/PC1_3s8.tif")
> image(t1pcs)
>
> but the color table seems wrong. I've checked with other programs, i.e.,
> IrfanView, and the file is correct. So I think that the problem is that
> col = heat.colors(12) is set by default, and the SpatialGridDataFrame
> object created by rgdal does not keep the color table.
>
> I've also tried with a 24-bit composite, and in that case rgdal imports
> as a 3-layer image.
>
> Is there any specific way I could import the color table of the
> composite image?
>
> Thanks
> --
> Dr. Agustin Lobo
> Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
> LLuis Sole Sabaris s/n
> 08028 Barcelona
> Spain
> Tel. 34 934095410
> Fax. 34 934110012
> email: Agustin.Lobo at ija.csic.es
> http://www.ija.csic.es/gt/obster
>
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-- 
Timothy H. Keitt, University of Texas at Austin
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