How to get white background in image superimposition

Him

I am superimposing two images, at the end i am getting some blue background, which I need to get rid of.. Instead I intend to get white background.

Please suggest me on procedure to get this..

%%% First image
G = imshow(flipud(rgb1));
ax1=gca;
colormap(ax1,'jet');
% c = colorbar(ax1,'Location', 'east','FontSize',20,'TickLabelInterpreter', 'latex');
% c.Title.Interpreter = 'latex';
% c.Title.FontSize = 16;
G.AlphaData = 0.5;
set(gca, 'YDir','normal')
axis equal
hold on;
%%%% second image
GH = imshow(flipud(rgb2));
ax2=gca;
colormap(ax2,'hot')
% c1 = colorbar(ax2,'Location', 'west','FontSize',20,'TickLabelInterpreter', 'latex');
GH.AlphaData = 0.5;
set(gca, 'YDir','normal')
axis equal

Answer 1

[Priyanka Rai]

You can try remove a background and then add white as background.

Refer this documentation on image background color property:

Control image component appearance and behavior - MATLAB (mathworks.com)

There are many ways to remove background. For a colored image, you can try this

http://www.mathworks.com/help/images/examples/color-based-segmentation-using-k-means-clustering.html

For a gray scale image, you can try this

http://www.mathworks.com/help/images/ref/graythresh.html

You can do background subtraction (for fluorescence and x-ray), background division (most ordinary situations), or background replacement (for video), depending on the situation.

Also, you can try using connected components. With simple problems, it could work. Please refer :

Changing image background from black to white - MATLAB Answers - MATLAB Central (mathworks.com)