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BitJazz
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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