Rec 709 to Rec 601 LUT

[Tim Farrell]

The color spaces are almost identical. I think the only difference is the green point is marginally bigger in 709.

[Rohit Gupta]

If you render to a SD YUV format (ProRes, DNxHD etc), the 601 matrix is automatically applied so you do not need a LUT for that.

[Gabriele Turchi]

rohit are U sure ? that would be cool …

PS:but DNxHD SD Quicktime actually does not exist …only MXF SD

g

[Michael Cinquin]

Here are my two cents :

– I think it’s a good idea to give a good thought about the 601 vs 709 color space. The color changes are not wild, but quite visible for a colorist

– from my tests FCP assumes colors are 601 when a quicktime is SD and 709 when HD

– Nuke with its color space node can do the conversion

– Steve Shaw from Light Illusion can probably build the LUT you’re after for 100€ (if he can’t, I could, contact me off site)

– but the only monitors that have 601 primaries are the old CRTs. I believe that today a DVD is much more likely to be watched on a 709 or srgb monitor than on one of these (and the srgb primaries are equal to the rec 709 primaries).

Michael Cinquin

Final Cut Pro – Avid Media Composer editor
DaVinci – Color – Baselight colorist
http://www.michaelcinquin.com/tools : tools for FCP | Color | RED | subtitles | Cinema Tools | Timecode – Keycode calculator

[Michael Cinquin]

Rohit, I believe you might be wrong.

I just downsized an HD quicktime to SD with the DaVinci. The HD quicktime has a test pattern on it, with 75% and 100% color patches.
In SD, the color patches are still perfect 75% and 100%. I believe this shows no transformation matrix has been applied.

Michael Cinquin

Final Cut Pro – Avid Media Composer editor
DaVinci – Color – Baselight colorist
http://www.michaelcinquin.com/tools : tools for FCP | Color | RED | subtitles | Cinema Tools | Timecode – Keycode calculator