I’ve been puzzling over the concept of WYSIWYG as used by @gez. I think what this means is as follows:
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If the output color space in the OCIO config file actually matches the calibrated and profiled screen on which the image is viewed,
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Then the user will always and only see the actual colors produced by the OCIO LUTs and other editing operations that are performed to transform the original image as encoded in the reference color space.
So it seems to me that if some other color space such as Rec.2020 is assumed by the OCIO pipeline as the output color space, then what the user sees on the screen isn’t what the user will get when the processed image file from the OCIO pipeline is saved to disk and opened with some other software, unless of course the user is actually looking at a Rec.2020 monitor.