Re: [ferret_users] Palette

[David Wang <dwang@xxxxxxxxxxxxxxxxx>]

Hi Angela,

If your original palette is, say, blue_darkred

use levitus_climatology
shade/pal=blue_darkred temp[k=1]

then darkred_blue is the reversed palette

shade/pal=darkred_blue temp[k=1]

All palette files are in $FER_DIR/ppl, please compare blue_darkred.spk 
and darkred_blue.spk to see how they differ. Not all palettes are in 
pairs. But you can always create your own reversed palettes. For 
example, the Ferret default is rainbow.spk:

$ cat rainbow.spk
   0.0   80.0    0.0  100.0
  10.0   30.0   20.0  100.0
  33.0    0.0   60.0   30.0
  66.0  100.0  100.0    0.0
  90.0  100.0    0.0    0.0
 100.0   60.0    0.0    0.0

You can create a reversed rainbow by flipping it round

$ cat inverse_rainbow.spk
   0.0   60.0    0.0    0.0
  10.0  100.0    0.0    0.0
  33.0  100.0  100.0    0.0
  66.0  0.0   60.0   30.0
  90.0  30.0   20.0  100.0
 100.0 80.0    0.0  100.0

then use

shade/pal=inverse_rainbow temp[k=1]

More palette tweaks can be found in the list archive.

HTH,
David

AV Gallego-Sala wrote:
> Hi!
>
> I would be very grateful if somebody could help me.
>
> I would like to know if there is an easy way to invert the default palette
> used in plots. I am using the shade command for a variable that goes from
> -5 to +5, and I would like negative numbers to be in the red spectrum and
> positive numbers to be in the blue spectrum (the opposite of what it is
> now).
>
> Thank you very much,
> Angela
>   

--
Daiwei Wang
Department of Earth and Environmental Sciences and
Lamont-Doherty Earth Observatory
Columbia University