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SheerVideo Power
Space Savings

Another way of looking at compression power is in terms of space savings, defined as

space savings = (1 - encoded size / uncompressed size) x 100%
For example, a codec with a compression power of 2 results in 50% space savings. From the point of view of space savings, a compression power of 4, corresponding to 75% space savings, is only 50% better than a power of 2. In fact, to save twice as much space as a 50% space savings, you'd have to save 100%, which corresponds to infinite compression! Clearly, incremental improvements in compression power yield diminishing returns in terms of space savings.

For a concrete example, each hour of D1 video (uncompressed standard-definition video in Y'CBCR 4:2:2 format) costs you 70 GB. Encoded in SheerVideo format, it only costs you 30 GB per hour, saving you 40 GB per hour, or nearly 60%.

Here's the same line-up of perfectly-fidelity QuickTime codecs, showing a comparison of space savings instead of power:

Codec Format Error Speed Space
Savings
(longer is better)
uncompressed RGB 8b 0.00 - 0%
QuickDraw RGB 8b 0.00 - 5%
Animation RGB 8b 0.00 43 6%
PNG RGB 8b 0.00 2 44%
Sheer RGB 8b 0.00 110 54%
Microcosm RGB 8b 0.00 1 56%
PhotoJazz RGB 8b 0.00 2 60%

uncompressed Y'CbCr 8bv 4:4:4 0.00 - 0%
Sheer Y'CbCr 8bv 4:4:4 0.00 115 64%

uncompressed Y'CbCr 8bv 4:2:2 0.00 - 0%
Sheer Y'CbCr 8bv 4:2:2 0.00 113 58%

uncompressed Y'CbCr 8bw 4:2:2 0.00 - 0%
Sheer Y'CbCr 8bw 4:2:2 0.00 113 56%

Perfect-Fidelity Video Codec Space Savings


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