How do I combine two images of different sizes like a photo frame?

I have two Images DSLR (My Photo and Photo frame), I need to make a photo frame for that i don't know how to combine both without any pixel loss. Kindly help me

[KSSV]

Why don't you attach your images and give a expected output?

[Magesh Anand]

I want the photo inside the frame

Answer 1

[Chad Greene]

Here's a quick and dirty way.

% Load images: 
man = imread('john-cena-3.jpg'); 
frame = imread('Transparent_Easter_Frame.png') ; 

% Make the frame the same size as the man: 
framer = imresize(frame,[size(man,1) size(man,2)]); 

% Find empty region of the frame (where all RGB values are zero):
whiteRegion = sum(framer,3)==0; 

% For context, here's the white region of the frame: 
imagesc(whiteRegion) 
axis off

% Display the picture of the man: 
figure
image(man)

% Overlay the picture of the resized frame: 
hold on
h = image(framer); 

% Make the white region of the frame transparent: 
set(h,'AlphaData',~whiteRegion); 
axis image off

[Image Analyst]

I think you could make an RGB image like this:

output = frame; % Initialize;
mask = cat(3, whiteRegion, whiteRegion, whiteRegion);
output(mask) = man(mask); % Replace white with man but only in mask region.
imshow(output);

Answer 2

[Image Analyst]

See my attached copy and paste demos.