[opendtv] Re: RGB mania
- From: "Alan Roberts" <roberts.mugswell@xxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 14 Jan 2005 12:16:14 -0000
Not quite right Jeroen. ITU.601 etc all include specifications for the
coding of RGB as well as YUV signals. They form a closed set. The rules for
Y also apply to RGB. Indeed, the coding of YUV comes from a digital
calculation using digital RGB signals, each of which must conform to 601
coding rules. At no point is there any flexibility in the coding of Y, since
it normally doesn't exist in analogue these days.
The headroom in the coding range is specifically for the RGB signals rather
than Y, the extra range that Y has as a result is almost accidental.
Alan
----- Original Message -----
From: <jeroen.stessen@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, January 14, 2005 11:51 AM
Subject: [opendtv] Re: RGB mania
> Hello,
> 3.
> With digital RGB "graphics" signals (e.g. DVI out) it is common
> to have black = 0, white = 255, but with digital YUV "video"
> signals (e.g. ITU-R.656 or SDI) it is common to have black = 16,
> white = 235. The Y signal has headroom that the RGB signals have
> not. This headroom is reserved for the ringing due to anti-
> Greetings,
> -- Jeroen
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