Color space of Toggle Heads-Up Image Info

RV
1

Hi
When I using Maya OCIO aceccg color space render images and ouput exr format in RV preivew checking, I get a confuse from the Toggle Heads-Up Image Info when I open it used RV
the Toggle Heads-Up Image Info below like this :

  1. arnold /colot_space is ACEscg (it is Maya output images color space )
  2. May I know what is mean the "ColorSpcae / Transfer " is linear color space and " Color Space /Primaries " is Rec709 in the bottom side , Can someone help please !!
    Cheers
    Shui