Fourier Transform – Image Compression

Fourier transform is useful for image compression. If you save the individual pixel colors less accurately, the image will look far from the original image. But if you save the spectrum less accurately, the picture just gets slightly blurry (better).

By doing a sophisticated analysis of the way the human brain processes image data, you can estimate which frequencies in a given image are “the most important”, and store those with high precision, while throwing away any “less important” frequencies.