Show HN: Discrete Fourier Transform on color eInk manga fixes rainbows [video] (youtube.com)

An interesting application of the 2D DFT to manga on color eink Kaleido 3 with math theory explained! Kobo Colour images. Most of the slides are based on the DFT chapter in Digital Image Processing: A Practical Approach by Nick Efford. I learned DFT to understand this algorithm.