MATLAB: I want to know how to find the size of original image & compressed image..

duplicate postImage Processing Toolbox

I want to find the size of compressed and original images size after applying FFT or DCT or PCA.Kindly if anyone have idea about it please share it with me.Thanks in advance.
p=imread('picture.jpg');
a=imresize(p,[100,100]);
%DCT
Z(:,:,1)=dct2(a(:,:,1));
Z(:,:,2)=dct2(a(:,:,2));
Z(:,:,3)=dct2(a(:,:,3));
for i=1:100
      for j=1:100
          if((i+j)>60)
               Z(i,j,1)=0;
               Z(i,j,2)=0;
               Z(i,j,3)=0;
           end
      end
  end
  K(:,:,1)=idct2(Z(:,:,1));
K(:,:,2)=idct2(Z(:,:,2));
K(:,:,3)=idct2(Z(:,:,3));
subplot(2,4,1);
%imshow(Z);
imshow(uint8(K));
title('70% compression');
How can we find the size of the '70%' compressed image i.e K ?

Best Answer

Look at the file size in your operating system. For example, use Windows Explorer. Or if you want to do it all in MATLAB, use imfinfo(), if you have the Image Processing Toolbox.
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