DV Info Net

DV Info Net (https://www.dvinfo.net/forum/)
-   General HD (720 / 1080) Acquisition (https://www.dvinfo.net/forum/general-hd-720-1080-acquisition/)
-   -   P22/SMPTE-C and BT.709 colorspace (https://www.dvinfo.net/forum/general-hd-720-1080-acquisition/47995-p22-smpte-c-bt-709-colorspace.html)

Xander Christ July 19th, 2005 08:18 PM

P22/SMPTE-C and BT.709 colorspace
I've been looking at HD monitors from Sony, JVC and Panasonic and noticed they list either P22 or SMPTE-C phosphors. Aren't these phosphor types optimized for CCIR 601 colorspace? If not, then what is the technical difference between 601 and 709? What is lost when converting 709 to 601? Everything I've edited has always been converted to RGB and then output to either 709 or 601 and I don't see that much difference.

Chris Hurd July 23rd, 2005 03:26 PM

You know Xander, this is actually a very good question. Of course, the short answer is that 601 spec is for SD signals and the 709 spec is for HD signals. But what exactly is the technical difference?

For a conversation starter, according to this excellent PDF: "Standard RGB Color Spaces" located at:


"601 and 709 phosphors are practically the same, but the 709 standard defines a different form of gamma correction..."

That entire document is a pretty good read.

All times are GMT -6. The time now is 07:16 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2020 The Digital Video Information Network