Re: [ferret_users] color palette with non-monotonic levels/ specify levels

[William Kessler <william.s.kessler@xxxxxxxx>]

You need RGB_Mapping By_Value. Here's an example off-centered blue-to-red spk file, where the numbers in the left column are in data units, and the next 3 columns are the RGB values:

RGB_Mapping By_value
-20 20 20 100
-2 85 85 85
1 85 85 85
42 100 20 20

Call this in the usual way in a SHADE or FILL command:

def sym clev "(-20,42,2,-1)dark(-10,40,10)del(0)"
fill/lev=($clev) MY_Variable

And search the manual for RGB_Mapping

Billy

> On Apr 16, 2018, at 7:53 AM, Paul Goddard <goddarpb@xxxxxxxxx> wrote:
> 
> Hello,
> 
> I'd like to create a color palette that has non-monotonic levels and be able to specify the level and color at each level.  I attached a figure from Nusbaumer et al. 2017 which gives an example of exactly what I would like to do. 
> 
> The blue_red_centered.spk has the correct colors... but the best method I could do to replicate the Nusbaumer figure is using level=20H.  
> 
> Thanks for the help!
> 
> Paul Goddard
> <Nusbaumer_2017_Fig4a.JPG>