Inverse Fourier transform in matlab for amplitude

Question

I have an image which is the amplitude of the Fourier transformation. I tried ifft but it does't work (I have a black image). So how can I do this?

I get this message:

Warning: Displaying real part of complex input.    

This is a piece of my code:

F=fft2(img);
F = fftshift(F);
F = abs(F);
F = log(F+1);
F = mat2gray(F);
F=ifft2(F);
imshow(F)

The idea is to take a picture of me and to do a Fourier transformation of it. Next, I cut the center of the Fourier transformation. I want to see how my picture looks like.

Answer 1

I think you just got the order wrong, let me know if this work

img = imread('whatever.png');
F = abs(fft2(img));
F = log10(1+F); 
F= fftshift(F);
imshow(F,[]);