Color gradient




Color gradient files extensions:

" ... I use Gimp gradients to generate my color maps. The file format is really simple but editing the palette by hand is a bit painfull. " (Yannick Gingras )
Colour Ramping for Data Visualisation Written by Paul Bourke
Julia blues & grays histogram by Duncan Champney
Image gradient
Programming of color gradients by Roman Pietrzak
Plasma by Lode Vandevenne
HSV - wikipedia

rainbow gradient : Function Rainbow  by Witold J.Janik

examples of use :


Here is color gradient created from Linas map file :
Baudline color picker
gradients in Gnuplot:




set palette rgbformulae 7,5,15 # default traditional pm3d (black-blue-red-yellow)
test palette




set palette color model HSV
set palette rgbformulae 3, 2, 2
or
set palette model HSV functions gray, 1, 1

show palette rgbformulae
* there are 37 available rgb color mapping formulae:
0: 0
1: 0.5
2: 1
3: x
4: x^2
5: x^3
6: x^4
7: sqrt(x)
8: sqrt(sqrt(x))
9: sin(90x)
10: cos(90x)
11: |x-0.5|
12: (2x-1)^2
13: sin(180x)
14: |cos(180x)|
15: sin(360x)
16: cos(360x)
17: |sin(360x)|
18: |cos(360x)| 19: |sin(720x)| 20: |cos(720x)|
21: 3x
22: 3x-1
23: 3x-2
24: |3x-1|
25: |3x-2|
26: (3x-1)/2 27: (3x-2)/2
28: |(3x-1)/2|
29: |(3x-2)/2|
30: x/0.32-0.78125 31: 2*x-0.84
32: 4x;1;-2x+1.84;x/0.08-11.5
33: |2*x - 0.5|
34: 2*x
35: 2*x - 0.5
36: 2*x - 1
* negative numbers mean inverted=negative colour component
* thus the ranges in `set pm3d rgbformulae' a
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Autor: Adam Majewski adammaj1-at-o2-dot--pl

Feel free to e-mail me. (:-))
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