Hi Walter, thank you for your suggestions.
One of the reason that I had to match the linear sRGB is our HDRI captured on set by DSLR is in sRGB gamut and "de-tone curve"ed and then merged in scene-referred linear.
Still about the the sRGB tone mapping of ACES. This footage shot by RED Raven.
In nuke default color management. Here I choose the “P3” colorspace or gamut in debayer setting, just because there has the same gamut in colorspace node. I transferred the colorspace into sRGB in order to pickup the code value to check with x-rite colorchecker’s target value. The result is similar to the x-rite target sRGB code value.
In OCIO ACES color management. The value ramp of the patches is not close to the target.
I know the sRGB ODT has a good tone-curve, but in our case we need a “traditional sRGB reference”. I use OCIOcolorspace to do a gamut conversion, and then use a colorspace node to do a traditional linear-sRGB curve conversion, In this way I can get a close result to nuke default, beside a little difference in saturation.
But don’t know how to do a correct conversion before applying ACES sRGB ODT.
Do you have any advice in our case?
Thanks!
Ivan