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Is Betacam sp 3:1:1 or 4:2:2?
I’d always assumed betacam sp was always in the 311 color space. (we use a sony d50) yet our DP said in theory it’s 311 but through some kind of hocus pocus technical stuff i didn’t understand the sampling is actually 422. clarification?
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19 Replies
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If memory serves me correctly, and as it’s an analogue format, it can’t really be described as either. However the luminance is layed in one stripe whereas the colour components are time compressed into a single stripe giving the effect of compression but it is only in the time domain and is stretched back on playback.
But as in almost all tape formats the colour information is sampled (analogue) at half the rate of the luminance ie, 13.5MHz for the luminance and ~6MHz for each of the colour components.
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[R. Hewitt] “If memory serves me correctly, and as it’s an analogue format, it can’t really be described as either.”
Exactly!
Charlie
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If I’m not mistaken though, people like adam wilt refer to betacam sp as the “equivalent” of 3:1:1.
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Guess I don’t know any people like Adam.
Charlie
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here’s adam wilt’s take:
Chroma resolution on BetaSP is essentially the same as on 4:1:1 DV, so were BetaSP a digital format, its sampling might be characterized as 3:1:1 for comparison purposes. Of course, BetaSP is not sampled on a fixed spatial grid, so such numerical comparisions should always be taken with a grain of salt.
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I had a long answer typed out and decided this statement doesn’t even warrant a reply.
Charlie
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no time for providing info to others but plenty of time for nasty sarcasm. I like your priorities.
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I had already given the information, I’m sorry if you miunderstood my remark. In 44 years in the business I have never heard of 3:1:1. I have never heard of analog being discussed in digital sampling terms. So, my comment was concerning the fact that I have no idea where he gets his philosophies, because I have never met anyone who discusses any of these matters in those terms.
Sorry that you took my comment as nasty sarcasm.
Charlie
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I don’t know where adam wilt gets his “philosophies” either but they don’t hand out degrees from Princeton to every Tom Dick and Harry. So I’m much less inclined to dismiss his ideas.
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I feel it is best that I not give my “philosophies” of many who have degrees, without experience in the real world.
So I feel it best to drop this discussion with the information I have already given.Charlie
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