Amazing.

Until I read this article I didn't properly understand Fourier transforms (I didn't know how image compression bitmaps were derived), now it's opened a whole new world - toying with my own compression and anything that can be continuous represented as it's constituent parts.

I can use it for colour quantisation too possibly to determine main and averaged RGB constituents with respect to hue, allowing colour reduction akin to dithering, spreading the error over the wave instead and removing the less frequent elements.

It may not work but it'll be fun trying and learning!