Abstract. Digital image processing area frequently uses Fourier Transform. Even this technique is found in several commercial application softwares dedicated to manipulate images. However, what does this operation really realize in the image? This paper intends to give a graphical interpretation of what is the meaning of applying Fourier Transform to a digital image in order to motivate professionals who work wih this technique so as to have a better understanding, and consequently, extract more possibilities from this powerful tool, when processing a digital image.