2-D Fourier Transform?

[hadi motamedi]

Dear All
To get 2-D Fourier transform from my image , I tried as :
->im=imread("image.png");
->img=rgb2gray(im);
->imd=im2double(img);
->size(imd)
->yf=fft2(imd,1024,768);
->yfa=abs(yf);
->yfs=yfa.^2;
At this point , I tried to make plots of it by using surf(yfa) or
Matplot(yfs) but none of them resulted to meaningful drawings. Can you
please let me know how can I obtain meaningful graphs for this
purpose?
Thank you