Superimpose two intensity images with some transparency and different colormaps

I have two intensity images (A and B). I want to superimpose image B on top of image A. The top image (image B) should have some degree of transparency (I want to be able to control the degree of transparency). The bottom image (image A) will have the 'gray' colormap {i.e. colormap(gray(256)} while the top image (image B) will have the 'jet' colormap {i.e. colormap(jet(256)}.

Please advice. Thanks!

Answer 1

[Walter Roberson]

Create two axes and put one image in each. With R2014b or later you can have one colormap per axes.

Before R2014b, you would need to convert one of the colormapped images into a truecolor image to deal with the limitation then-existing of one colormap per figure. The File Exchange utility freezeColors can help with that.

Answer 2

[Image Analyst]

See these links:

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image