I ran some pipe tests here using nuke and OCIO , comparing things like writing ap0 vs ap1 and writing 16 vs 32bit and then comparing back to the source, to quantify the loss.
for some reason that I cant point my finger to excactly - the linear AWG (alexa-wide-gamut) IDT behaves different to the Linear/RED and AP0 roundtrips , even going via linear/709 yields the same loss as RED and Ap0 but going from Alexa to acesCG or Ap0 yields pretty weird numbers.
Anyone can tell me why this is?