How to scale the range of a custom colormap correctly?

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);

Answer 1

[Adam Danz]

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:

• Control Colormap Limits
• Steve Eddin's Blog: CLim, caxis, imshow, and imagesc

[Thomas Taufan]

I have successfully scaled the colormap limits of the axes to the one that I wanted. Glad and thankyou for the answer.

[Thomas Taufan]

Do you know how to save the custom color map to a variable like jet, winter, parula, etc?

[Adam Danz]

Hmmm, not sure I understand. If you created a custom colormap (nx3 matrix) you must have saved it to a variable such as (fake color map),

cmap = rand(256,3); 

or

cmap = jet(256);