MATLAB: How to scale the range of a custom colormap correctly

colorcolor mapcolormapcustomcustom color mapcustom colormaprangescalescaling

I have made a custom colormap manually and I need it to be scaled from -1 to 1, in the result I got it is scaled from about -0.25 to 0.45.

This is the right scale for the custom colormap.

I have saved the variable of the colormap manually by inputting it to a variable. For example :

    custom = [  0 1 1
                1 0 0
                1 0 1];

How can I save it so that I could use the colormap like other presets anywhere, for example :

    colormap(jet);

Best Answer

Use caxis(limits) to scale the colormap limits of the axes. I also recommend including the optional axis handle input (see documentation within the link).

More info on color scaling:

Related Solutions

MATLAB: How to make the ticks in the colorbar appear at the center of each color in MATLAB 7.0 (R14)

You can manually set the position of ticks on the colorbar axis by using the CAXIS function to set the color axis limits, and setting the 'YLim' and 'YTick' properties of the colorbar, as shown in the following example:

A = ceil(5*rand(5,7));
imagesc(A);
numcolors = 5;
colormap(jet(numcolors));
caxis([1 numcolors]);
cbarHandle = colorbar('YTick',...
[1+0.5*(numcolors-1)/numcolors:(numcolors-1)/numcolors:numcolors],...
'YTickLabel',int2str([1:numcolors]'), 'YLim', [1 numcolors]);

MATLAB: Editing a Colormap in MATLAB

My suggestion would be to create an image, set it as you want, save the colormap and color axis limits to a mat file.

cmap = colormap(gca);
cl = caxis;
save cmap.mat cmap cl

Then, when you want to use the same colormap, load the mat file, and set the colormap and color axis limits to the values loaded in the mat file.

load cmap
contourf(X,Y,z)
colormap(cmap);
colorbar
caxis(cl);

Best Answer

Related Solutions

MATLAB: How to make the ticks in the colorbar appear at the center of each color in MATLAB 7.0 (R14)

MATLAB: Editing a Colormap in MATLAB

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