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djl47
26th May 2015, 02:56 AM
Here's a great video from Computerphile (A sibling channel to Numberphile) that explains how DCT (Discrete Cosine Transform) is used to remove high frequency information from an image making it more compressible.

https://www.youtube.com/watch?v=Q2aEzeMDHMA

lsatenstein
26th May 2015, 03:34 AM
excellent explanation, Thanks for the link

djl47
26th May 2015, 06:47 AM
In the first video the narrator makes references to RGB (Red Green Blue) YCbCr (Which is a way to encode RGB info http://en.wikipedia.org/wiki/YCbCr) and YMC (Yellow Magenta Cyan) This video helps explain colourspaces
https://www.youtube.com/watch?v=LFXN9PiOGtY