R terra tif import colormap

Question

When importing a .tif raster with terra::rast(), also a colormap is imported. Is there any way to force the function to not import the colormap, or to set it to NULL to use the default plot color palette?

You can see the color table with:

terra::coltab()

Please, provide a reproducible example so that we can best help you — lovalery, Sep 27 '21 at 15:13

score 2 · Accepted Answer · answered Sep 29 '21 at 20:15

2

Example data

library(terra)
r <- rast(ncols=3, nrows=2, vals=0:5)
coltb <- data.frame(t(col2rgb(rainbow(6, end=.9), alpha=TRUE)))
coltab(r) <- coltb

Normally, you should be able to do

coltab(r) <- NULL

But I see that the CRAN version has a bug (now solved in version 1.4-5). To work around it, you can do

coltab(r, 2) <- NULL

answered Sep 29 '21 at 20:15

Robert Hijmans

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Thank you, Robert - I had hoped that you would see this. This confirmed my suspicion that there was a bug in the CRAN version. – Silviculturalist Oct 01 '21 at 08:11

R terra tif import colormap

1 Answers1