set palette color to blue in gnuplot

问题

I am trying to get a contour map using gnuplot using pm3d and view map while everything else is fine, I cannot convert it to the colorscheme I want.

The present picture, using default colour scheme is attached.

But, it will be great if I can have it in Blues's sheds, from Dark Blue to lighter. I was trying to follow instruction given here, but failed. Kindly help.

回答1:

See the gnuplot documentation about set palette:

set palette defined (0 'dark-blue', 1 'light-blue')
test palette

or

set palette defined (0 '#0000bb', 1 '#8888ff')

回答2:

If you want the highly requested but criticized (see links below) Matlab Jet colormap, just do:

f(x)=1.5-4*abs(x)
set palette model RGB
set palette functions f(gray-0.75),f(gray-0.5),f(gray-0.25)

Which, I think, is better than the usual way:

set palette defined ( 0 '#000090',\
                      1 '#000fff',\
                      2 '#0090ff',\
                      3 '#0fffee',\
                      4 '#90ff70',\
                      5 '#ffee00',\
                      6 '#ff7000',\
                      7 '#ee0000',\
                      8 '#7f0000')

for more information, see the manpage for palette

---

• The 'jet' colormap must die!
• The ‘jet’ colormap, the default colormap in MATLAB, is a perceptual disaster
• Rainbow Color Map (Still) Considered Harmful

来源：https://stackoverflow.com/questions/20285532/set-palette-color-to-blue-in-gnuplot