As mentioned twice above, the real CD and DVD compression advantages are nearly all reserved for images. This is readily understood when looking at a typical photograph. If an outdoor landscape, note the blue sky may take up 20% of the photo. Why waste all the hundreds of thousands of pixels when a few bytes will describe the sky color and then its location, height and width take up a small amount more. Only when the neighboring pixels are exhibiting a change does that information need to be preserved. Thus depending upon the simplicity or complexity, video compression techniques may provide for lossy compressions from 5:1 to 200:1 with 50 being a typical order of magnitude.
Read more at http://www.datadisc.comTuesday, April 1, 2008
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