how to combine image, using hold on in looping

hi everyone, i try to combine some image to be one but its doesnt work

i have 3 image

1. its background image (orange color)
2. its layer background
3. its main image

i can combine the 1 and 2 with hold on

but if i try hold on in number 3, number 1 and 2 gone

imshow('background.png');
hold on;
bgimage = ['terbuka.png'];
[im1, map, alpha] = imread(bgimage);
f1 = imshow(im1);
set(f1, 'AlphaData', alpha);

plotcount=1
for k=1:3
    for j=1:3
        subplot(4, 4, plotcount);
        plotcount=plotcount+1;
         image2 = ['Star.png'];
        [im, map, alpha] = imread(image2);
        f = imshow(im);
        set(f, 'AlphaData', alpha);
       
    end
end

[Image Analyst]

Please attach star.png, terbuka.png, and background.png.

[faris fais]

background.jpg

terbuka.png

star.png

Answer 1

[Satwik]

Hi @faris fais,

I understand that the aim is to overlay multiple images using MATLAB, but the issue arises when adding the third image, causing the previous images to disappear. This is likely due to the way 'subplot' is used, which creates new axes each time it is called, thus not preserving the previous images. Here is a modified version of the code which combines all the three images:

% Display the background image
imshow('background.png');
hold on; % Retain current plot

% Read and display the layer background image
bgimage = 'terbuka.png';
[im1, map, alpha] = imread(bgimage);
f1 = imshow(im1);
set(f1, 'AlphaData', alpha);

% Loop to overlay the main images
for k = 1:3
    for j = 1:3
        % Read and display the main image
        image2 = 'Star.png';
        [im, map, alpha] = imread(image2);
        f = imshow(im);
        set(f, 'AlphaData', alpha);
        
        % Optionally, adjust the position of the images if needed
        % For example, you can set the 'XData' and 'YData' properties
        % to place images at specific locations.
        % Example: set(f, 'XData', [x_position], 'YData', [y_position]);
    end
end

Given below is the resulting image from the above script:

I hope this helps!