How to overlay two colormaps using imagesc command?

I want to overlay two colormaps in a single figure. The background image A is an anatomical image and B is the ROI I would like to place on the anatomical image A. Color A was using gray and Color B was using hot. However, when I used the code I attachec below, image A and B became the same size and completely overlayed themselves. I am not sure why this is happening. Please help.

Attached is my code:

ax1 = axes;

colormap(ax1,'gray');

A = imagesc([0,1600],[-130005,10000],fliplr(Image));

%create a mask B with spectral peak values;

ax2 = axes;

colormap(ax2,'hot');

B = imagesc([437.5,962.5],[-73500,-45000],mask); %define the minimal/maximal range of the mask;

set(ax2,'color','none','visible','off');

Answer 1

[Abhilash Padma]

The ROI is overlaid completely in your case because the limits of the 2-D axes are not synchronized properly. You can use linkaxes method to synchronize limits of 2-D axes which may solve your problem. Here is the example below:

I=imread('mri.jpg');
mask=rgb2gray(imread('roi.jpg'));
ax1 = axes;
A = imagesc([0,1600],[-130005,10000],I);
ax2 = axes;
B = imagesc([437.5,962.5],[-73500,-45000],mask); 
linkaxes([ax1,ax2]);
ax2.Visible = 'off';
ax2.XTick = [];
ax2.YTick = [];
colormap(ax1,'gray');
colormap(ax2,'hot');
set(ax2,'color','none','visible','off');