- Posts: 88
- Joined: Wed Jan 14, 2015 4:29 am
Sorry if I'm a bit thick but all the info I could find on this issue is not very clear at all.
How exactly is the compression of Raw working taking into account the following (from the BM Ursa specs):
Storage Rates
4608 x 2592
CinemaDNG RAW 3:1 - 180 MB/s
CinemaDNG RAW 4:1 - 135 MB/s
Recording Formats
Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1
I understand that Raw compression can be akin to zipping a file, so it is lossless. But I don't understand the above even taking that into account:
1) The recording formats cites "Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1" - Does that mean that it's Raw uncompressed, and then the compressed versions 3:1 and 4:1?
OR does that mean that it's Raw in either 3:1 and 4:1.
Not trying to be picky, but grammatically that statement with the comma as in "Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1" denotes 3 separate things.
If it is so, then what's the storage rates for uncompressed raw? You can clearly see the rates for 3:1 and 4:1, but no uncompressed.
2) If the compression is lossless, then why have a 3:1 AND a 4:1 ratio? Wouldn't it make sense to keep it at the 4:1 to get better data rates. I mean lossless is lossless... why work with 180 mb/s when you can work with 130 mb/s and get same result.
It's probably something I'm missing but if anyone here can explain this it would be much appreciated.
Thank you!
How exactly is the compression of Raw working taking into account the following (from the BM Ursa specs):
Storage Rates
4608 x 2592
CinemaDNG RAW 3:1 - 180 MB/s
CinemaDNG RAW 4:1 - 135 MB/s
Recording Formats
Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1
I understand that Raw compression can be akin to zipping a file, so it is lossless. But I don't understand the above even taking that into account:
1) The recording formats cites "Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1" - Does that mean that it's Raw uncompressed, and then the compressed versions 3:1 and 4:1?
OR does that mean that it's Raw in either 3:1 and 4:1.
Not trying to be picky, but grammatically that statement with the comma as in "Lossless CinemaDNG RAW, RAW 3:1 and RAW 4:1" denotes 3 separate things.
If it is so, then what's the storage rates for uncompressed raw? You can clearly see the rates for 3:1 and 4:1, but no uncompressed.
2) If the compression is lossless, then why have a 3:1 AND a 4:1 ratio? Wouldn't it make sense to keep it at the 4:1 to get better data rates. I mean lossless is lossless... why work with 180 mb/s when you can work with 130 mb/s and get same result.
It's probably something I'm missing but if anyone here can explain this it would be much appreciated.
Thank you!