change colors of an array

I've got the following array. M = [0 1 0; 1 0 1; 2 0 3];

imagesc(M)

How can I change the colors of the image?

[Paolo]

Have you tried changing the values contained in M ?

Answer 1

[Ameer Hamza]

the color of the square depends on the colormap of the axis. Try

ax = gca;
ax.Colormap

by default colormap is

    0.2422    0.1504    0.6603
    0.2504    0.1650    0.7076
    0.2578    0.1818    0.7511
    ....
    ....
    0.9691    0.9606    0.1064
    0.9769    0.9839    0.0805

These are RGB colors. The value in your matrix M, along with the colormap and clim property of axes object which color will be displayed. For more information, refer to the properties of MATLAB axes object and search for Colormap and CLim.

https://www.mathworks.com/help/matlab/ref/matlab.graphics.axis.axes-properties.html