 Finds blocks (varying size) of similar colors and makes them all the same color. Bad for VFX and color-correction. Almost all codecs use this to some degree, and the amount tends to vary with the bitrate.  Finds blocks (varying size) of similar colors and makes them all the same color. Bad for VFX and color-correction. Almost all codecs use this to some degree, and the amount tends to vary with the bitrate. 