How to save concatenated images in MATLAB?

I am trying to concatenate two 256x256 images and save them using imwrite. The saved image is supposed to be 256x512, but when I load the saved image, the size shows to be 343x434x3. How do I solve this?

the code I am using is:

new_name3 = strcat(f_name_image, '\', kk, '_', num2str(ff), '_pair.png');
pair = [orig_im  noisy_image]; %concatenating two 256x256 images
imagesc(pair)
f = getframe(gca);  
im = frame2im(f);
imwrite(im, new_name3);

[Alexander]

try "imwrite(pair, new_name3);" instead

Answer 1

[Sourabh Kondapaka]

Hi,

You can save the image without using the “imagesc()” function as follows:

new_name3 = strcat(f_name_image, '\', kk, '_', num2str(ff), '_pair.png');
pair = [orig_im  noisy_image]; %concatenating two 256x256 images 
imwrite(pair, new_name3); 

However, if you do need to use “imagesc()” function, then please do the following:

new_name3 = strcat(f_name_image, '\', kk, '_', num2str(ff), '_pair.png');
pair = [orig_im  noisy_image]; %concatenating two 256x256 images 
scaled_image = imagesc(pair); 
imwrite(scaled_image.CData, new_name3); 

The “imagesc()” function returns an “image” object. You need to extract the matrix values from the image object when writing into a file.

“CData” property of the “Image” object stands for “Color Data” which is the matrix values of the concatenated image.

If you would like to learn more about the “Image” object and its properties, please check here.