What to the letters "BT" stand for in the "recommendation"?
I'm thinking of moving (renaming) this page to BT.709. "Rec." is the historical prefix, from the days when the organization was CCIR (dealing with radio). CCIR and CCITT (which had its own Recs.) were incorporated into ITU. However, there are other "Recs." from ITU, such as ITU-T G.709. The cover page of the document itself reads "Recommendation ITU-R BT.709-5," so the Rec. and the 709 aren't contiguous. It seems to me that BT.709 is relatively unambiguous, and it matches the notation in the standard itself. Also, I propose the same treatment for Rec. 601. Comments? (talk) 20:29, 2 March 2012 (UTC-5)
HD SD convert
"Whenever SDTV is upconverted to HDTV, or HDTV is downconverted to SDTV, at the studio or at the consumers' premises, luma-chroma matrixing is required."
Quote:"The colours produced by red, green and blue signals, with each of the others turned off, should be within the EBU tolerance boxes in EBU Tech 3273 . The difference between the gamuts of ITU-R BT.709  (HDTV) and EBU (SDTV)  systems is so small as to be negligible." Source:EBU – TECH 3321
The above statements are both correct, the EBU one refers to colour correction matrixing (also known as masking)and the second one luma matrixing to convert Rec 709 to Rec 601 signals, two entirely separate operations, so your stupid deletion was nothing short of ignorant vandalism. You should not edit things about which you clearly understand absolutely nothing. — Preceding unsigned comment added by 220.127.116.11 (talk) 00:06, 20 March 2014 (UTC)