DV is 25 to 1 compression while Photo-Jpeg is 2 to 1. Having said that then I assume that DV 50 is 12.5 to 1? If this is indeed true then isn’t Photo-Jpeg a better choice due to less compression?
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Well, first off, you’re getting numbers confused. DV is compressed at 5 to 1 (perhaps you’re thinking of 25 mbps?).
And I don’t think that means DVCPRO50 is 2.5 to 1…I’m not sure that it’s that simple. Although I have to say that I don’t know what DVCPRO50’s ratio is so I really can’t comment.
All numbers aside, however, you can’t really say that one is better than another based only on compression ratios. The KIND of compression matters a lot too. As a crude example, imagine simply cropping the top half of a video off so that the screen is half sized. That would be 2 to 1 compression, but clearly not as good as DV!
That’s a bit far fetched, but my point is that you need to look at HOW the space is being saved, not just how much is being saved. What’s being lost? Color sampling? Resolution? Entire frames (as in HDV). Depending on what you need, the “TYPE” of compression you’re talking about may be just fine or terrible. And it doesn’t always match up with which one has “more” or “less” compression.