I am trying to understand some really basics of image processing. One of them is the DFT ( Discrte Fourier Tranform). I have seen code segments, read stuff but still I don't get how the image produced is related to the first one. For example, I take an image with vertical black and white stripes, and I get an image (after applying DFT) that has some dots in it. Now how does the mapping works? What do I mean? How does point (1,0) of the first image relates to point (1,0) of the DFT image? How does the mapping works?