15.04.2020, 12:11
Yep, when you upscale SD to HD you need to apply Rec601 to HD Rec709.
I tested and proofed this in DaVinci Resolve. DaVinci Resolve automatically manage SD or HD matrix depending of resolution, so if i upscale SD to HD in Hybrid and don't apply Rec601 to HD Rec709 color, i always see color shift in DaVinci Resolve compare so original SD video.
Note that even if most SD video is coded with Rec601, a lot of computer video players can not read Rec601 correctly and so they always process both SD and HD video as Rec709. This is another reason to upscale SD to HD. When you upscale SD to HD and apply Rec601 to HD Rec709 transformation, you will now always see real original correct colors.
I tested and proofed this in DaVinci Resolve. DaVinci Resolve automatically manage SD or HD matrix depending of resolution, so if i upscale SD to HD in Hybrid and don't apply Rec601 to HD Rec709 color, i always see color shift in DaVinci Resolve compare so original SD video.
Note that even if most SD video is coded with Rec601, a lot of computer video players can not read Rec601 correctly and so they always process both SD and HD video as Rec709. This is another reason to upscale SD to HD. When you upscale SD to HD and apply Rec601 to HD Rec709 transformation, you will now always see real original correct colors.