How to standardize the colormap of every figure created from different set of data

i want to generate figures with the same color at the background (as you can see the current figures i have generated have different color intensitiy because of different range of data used). My current simple basic codes are below:

  h = figure(); 
    surf(SMImage{SMImageNumber},'edgecolor','none'); 
    colormap(jet(256));
    colorbar;

So, how can i standard the colormap so that every figures generated will have the same color background (preferably in blue, because thats what i commonly noticed in previous work) ?

[Mohammad Sami]

See if this helps.

https://www.mathworks.com/help/matlab/creating_plots/change-mapping-of-data-values-into-the-colormap.html

Answer 1

[Robert U]

Hi NUR AMIRA ZULKIFLLI,

you can supply own colormaps to several plots. You might want to look into imagesc() since it provides limits as well.

[X,Y,Z] = peaks(100);
dLim = [-4, 4];

newFh = figure;
ah = axes(newFh);
imagesc(ah,X(1,1:end),Y(1,1:end),Z,dLim);
cbh = colorbar(ah);
colormap(ah,cmStd([0,0,1],[1,1,1],[1,0,0],256,false))

cmStd:

function cmap = cmStd(firstColor,midColor,endColor,n,binv)
    % cmStd - returns a colormap array
    %
    % generates an Nx3 array of the RGB values of a colormap that ranges 
    % from first color at the low end, midColor in the middle, and endColor at the high 
    % end. The colormap can be inverted.
    %
    % USAGE
    % cmap = cmStd([0,0,1],[1,1,1],[1,0,0],256,false) % blue to red over white
    %
    % INPUTS
    %   firstColor - rgb triplet, color of lowest value
    %   midColor   - rgb triplet, color of lowest value
    %   endColor   - rgb triplet, color of lowest value
    %   n          - (optional) the number of bins in the colormap. 
    %                Default is 64.
    %   binv       - (optional) logical, invert colors
    %                Default is false.
    %
    % OUTPUTS
    %   cmap - the Nx3 colormap that can be used with the 'colormap' command

    if nargin <=3
        n = 64;
        binv = false;
    elseif nargin == 4
        binv = false;
    elseif nargin > 5
        error('Too many inputs. Expected up to four, got %d',nargin)
    end
    
    validateattributes(firstColor,{'double'},{'size',[1 3],'<=',1,'>=',0});
    validateattributes(midColor,{'double'},{'size',[1 3],'<=',1,'>=',0});
    validateattributes(endColor,{'double'},{'size',[1 3],'<=',1,'>=',0});
    validateattributes(n,{'double'},{'integer','scalar','>=',3});
    validateattributes(binv,{'logical'},{'nonempty','scalar'});
    
    % set the x, y, and z valules and interpolate
    x           = [1,n/2,n];
    y           = 1:3;
    
    
    xnew        = 1:n;
    ynew        = 1:3;
    
    [x,y]       = meshgrid(x,y);
    [xnew,ynew] = meshgrid(xnew,ynew);
    
    z(:,1)      = firstColor';
    z(:,2)      = midColor';
    z(:,3)      = endColor';
    
    cmap        = interp2(x,y,z,xnew,ynew)';
    if binv
        cmap = flip(cmap,1);
    end
    
end

Kind regards,

Robert