createcolormap

version 0.2 (1.74 MB) by Takuya Miyashita
This function allows to create colormap Nx3 array (RGB) with an arbitrary combination of colors.

53 Downloads

Updated 9 Oct 2021

From GitHub

View License on GitHub

createcolormap.m

View createcolormap on File Exchange
This function allows to create colormap Nx3 array (RGB) with an arbitrary combination of colors. RGB values between the specified colors will be smoothly connected by linear interpolation.

Example

cmap = createcolormap(C);
cmap = createcolormap(n,C);
cmap = createcolormap(colorA, colorB);
cmap = createcolormap(n, colorA, colorB);
cmap = createcolormap(colorA, colorB, colorC, colorD, ...);
cmap = createcolormap(n, colorA, colorB, colorC, colorD, ...);

where n is the number of segments for the output color scheme, and C is the RGB matrix of color junctions.

Usage

  • blue-white-red (polar)

    b = [0,0,1];
    w = [1,1,1];
    r = [1,0,0];
    
    bwr = createcolormap(b,w,r); % 256x3 array
    
    colormap(bwr)
    colorbar

    If you want to use dark blue and red colors, try below:

    b = [0.0,0.0,0.5];
    w = [1.0,1.0,1.0];
    r = [0.5,0.0,0.0];
    
    bwr = createcolormap(b,w,r); % 256x3 array
    
    colormap(bwr)
    colorbar

    To create a more discrete color structure, input the number of elements in the first argument as shown below.

    bwr = createcolormap(16,b,w,r); % 16x3 array 
  • more complicated combination

    colorA = [0.0,1.0,0.0];
    colorB = [1.0,0.5,0.5];
    colorC = [0.5,0.5,0.5];
    colorD = [1.0,1.0,0.0];
    
    cmap = createcolormap(64,colorA,colorB,colorC,colorD); % 64x3 array
    
    surf(peaks); 
    colormap(cmap);
    colorbar;
  • RGB matrix

    cmap = createcolormap(rand(10,3)); % 10 random colors
    
    surf(peaks);
    colormap(cmap);
    colorbar;

License

MIT

Author

Takuya Miyashita
Disaster Prevention Research Institute, Kyoto University

Update

v0.1 2021/10/01
v0.2 2021/10/09

Cite As

Takuya Miyashita (2022). createcolormap (https://github.com/hydrocoast/createcolormap/releases/tag/v0.2), GitHub. Retrieved .

MATLAB Release Compatibility
Created with R2021b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.