Talk:Rec. 601

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Is the 270 Mbit/s format really optional?[edit]

"optionally encoded"? My impression is that the 270 Mbit/s format is universal for interconnect. Various sub- and super-sets are used as derived formats, but 270 is used for patching.

You seem to speak from experience, so what you say is probably what happens in practice. I was trying to summarize what the spec. says, regardless of whether anybody uses all these format variants or not. -- Heron

4-bit chroma? Seriously?[edit]

I have not found in the standard than any chroma sample could be coded with four bits, it just mentions that samples could be optionally coded with 10 bits. Where do these 4 bits per chroma sample come from ? -- Valkyra3


I have studied the latest version ot the Rec. ITU-R BT.601-5 and it does not determine the serial format component order. The Serial format and component order is defined in Rec. ITU-R BT.656 (SDI, Serial Digital Interface). -- pam

Any serial format but the 10-bit format, is virtually extinct. In the early days of serial digital interfaces, reducing the datarate could significantly reduce the cost and/or increase the reliability of a link, so the lower-bitrate versions made sense.

Today, the 10-bit interface is extremely reliable, inexpensive, and ubiquitous; the other interfaces are mainly of historical interest. (That, and there are still many concessions to the 8-bit interface in other standrds, such as SMPTE 291M). --EngineerScotty 04:17, 6 March 2006 (UTC)

Sync encoding[edit]

Could somebody explain what this refers to? Adoniscik 21:54, 21 July 2007 (UTC)

Heading incorrect?[edit]

Why is this article still called "CCIR 601" if the official name has been changed to "ITU-R BT.601"? I propose it be moved to "ITU-R BT.601" Ozhiker 14:31, 29 August 2006 (UTC)

Agreed.-- 21:52, 21 July 2007 (UTC)


Does anyone have a chromaticity diagram showing the gamut of 601 that we can add here? I feel it is somewhat lacking when compared to the 709 article. (talk) 09:53, 8 March 2009 (UTC)

Disagreement over the meaning of "YUV J:a:b" expressions[edit]

Chroma_subsampling#Sampling_systems_and_ratios does not agree with what is implied by the following quote from this article:

The color encoding system is known as YUV 4:2:2, that being the ratio of Y:Cb:Cr samples (luminance data:blue chroma data:red chroma data).

Although the numbers are the same in this example, the implication for YUV 4:2:0 is clearly false. -- (talk) 16:24, 13 August 2009 (UTC)

Indeed, clearly false, so I took it out. Dicklyon (talk) 16:48, 13 August 2009 (UTC)

Byte order[edit]

Is the storage order definitely Y1:Cb:Y2:Cr? I have seen Cb:Y1:Cr:Y2 used also, but I don't have the spec in front of me so I don't know what's definitive... (talk) 17:50, 13 August 2009 (UTC)