It receives information about the spacial frequency content of the image. If you're unfamiliar, it's definitely worth looking into the specifics of how this wor

It receives information about the spacial frequency content of the image. If you're unfamiliar, it's definitely worth looking into the specifics of how this works, as it's quite impressive! Here's a few relevant Wikipedia articles, and a Computerphile video: https://en.wikipedia.org/wiki/JPEG#JPEG_codec_example https://en.wikipedia.org/wiki/JPEG#JPEG_codec_example https://en.wikipedia.org/wiki/Discrete_cosine_transform https://en.wikipedia.org/wiki/Discrete_cosine_transform https://www.youtube.com/watch?v=Q2aEzeMDHMA https://www.youtube.com/watch?v=Q2aEzeMDHMA