OCIO color conversion to match input image

[Jim Meston]

Hi,

Just having a small issue with color matching, not sure if it's vray or something more intrinsic to OCIO conversions.

I input an BG tex with transforms then view it in the VFB with the display transform and the color is different.

Any help appreciated.

best,
Jim

[Muhammed_Hamed]

This is expected behavior, because the ACES Output transform includes Tonemapping. It uses an S shaped curve to enhance mid-tone contrast and compress shadows and highlights.
If you want a perfect match(if you have a logo or backplate) you should use,
In, Out sRGB(if this is what you use in the frame buffer)
Out, ACEScg

This way you gonna get a perfect match... You shouldn't do this with all your textures though

[Muhammed_Hamed]

On another note, do yourself a favor and use the most recent version of ACES here.. ACES 1.2
https://github.com/colour-science/OpenColorIO-Configs

[Jim Meston]

Thanks for that. I will also update to the latest OCIO.