How to save layered images

Hi,

I'm currently working with gaze data and showing the results of the gaze data as a heat map superimposed on a visual stimulus.

I first show the stimulus in the background and then add the heatmap layer on top of it with the transparency data. handles.background is an m-by-n-by-3 truecolor matrix of double class. filtered is the heatmap data.

imH = imshow(handles.background);
hold on;
h = imshow(filtered, 'Colormap', jet);
hold off;
set(h, 'AlphaData', alphaMap);

The problem I have is saving the resulting layered image. I've tried using getframe(gca) , but it only returns the stimulus without the heatmap, and using getimage(gca) returns the heatmap values without the stimulus. Is there a direct way of obtaining the layered image?

[David]

I'm aware that one can use print() to do this, but it saves the whole figure, which means that it also includes the UI components of my figure when I just want the resulting image itself.

Answer 1

[Image Analyst]

Try calling imwrite() with your original image and the overlay image and saving it as a PNG image.

[Image Analyst]

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