Overlaying one image on another gives blue boxes instead of image - MATLAB

Question

I am trying to overlay one image on top of another in MATLAB.

I checked out Superimpose two images in MATLAB for an answer. But the issue is that the overlayed images are being shown as blue boxes on the original image, instead of the actual image.

The incorrect output is shown here http://imgur.com/R1QZh32.

The code I am using is

    a = 0.2;
    tform = affine2d([1 0 0; a 1 0; 0 0 1]);
    B = imwarp(z,tform, 'FillValues',255);
    B = ~B;
    figure; imshow(B);
    h = imagesc([X1 X2], [Y1 Y2], B);
    set(h, 'AlphaData', 1);

The normal imshow(B) shows me the correct image but the overlaying part is giving me the problem.

I have tried changing the value of AlphaData but that doesn't seem to be working.

Answer 1

Have a look to function imshowpair with properties Blend

You can try this too :

figure;
h = imshow(FirstImage);
set(h,'AlphaData',0.2);

hold on;
imshow(SecondImage);    
hold off;