How to make a grayscale image semi transparent?

I have two grayscale images in which one of them is registered to the other.

How can I make the mapping image semitransparent and overlay it on the registered image?

Note both pictures are gray scale.

Thanks, Shayan

Answer 1

[Walter Roberson]

Both image() and imagesc() construct objects of class "image"; "image" objects have an AlphaData property. You can either set() that property after the return from image() or imagesc(), or you can pass a name/value pair for AlphaData as part of the image() or imagesc() call

[Shayan]

I tried;

figure, imshow(IB_trans2,'XData', xdata, 'YData', ydata)

hold on

%%

h = imshow(IA);

set(h, 'AlphaData', 0.6)

and it works!

Thanks Walter

Answer 2

[nishant]

thanks a lol. it works and its musch simpler than what I was trying to do.