[GRASS-user] A better way to create color table out of "GLC_EU_V2.clr" for r.colors

[Hamish]

Nikos Alexandris wrote:

> A file called GLC_EU_V2.clr (contains RGB color values) comes along
> with EUv2_binary.zip (the Global Land Cover 2000).
> 
> It's structure is (output from "cat GLC_EU_V2.clr | head -30")
> # value red green blue
> 
> 0 0 0 0
> 1 0 99 0
> 2 0 150 0
> 3 175 255 99
> 4 140 68 17
> 5 204 127 96
[...]
> 255 0 0 0
> 
> ---
> I try to make a color table for r,colors out of this and I use:
> 
> command:
> cat GLC_EU_V2.clr | head -28 | tail -25 | cut -d' ' -f2,3,4 | tr " "
> ":"
> | cat -n
> 
> output (*note the spaces in front of each line):
>      1  0:99:0
>      2  0:150:0
>      3  175:255:99
>      4  140:68:17
>      5  204:127:96


no need for the "0" rule?

> Is there a better/ shorter way?

sure, r.colors can read the original without need to convert "R G B"
to "R:G:B" or remove any extra spaces.


> How can I eliminate the spaces in front
> of each line (or how can I produce them better?)?
> Probably "sed" holds the answer but it takes time to learn.

awk '{print}'
  or
sed -e 's/^[ ]*//'
  or
sed -e 's/^\s*//'
  or
sed -e 's/^[:space:]*//'


see http://www.regular-expressions.info



Hamish



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