In Rhino 6 I used:
to change the gamma settings of the material preview
This is obsolete since Rhino7
Probably I should use Rhino.Render.LinearWorkflow (??) now?
But how can I use it?
Not sure how that works for material previews. Why do you need to change the gamma setting for material previews?
I think we need to ask @andy to figure out how that is supposed to work, though.
As I was thinking about it I realized it is probably better to handle the gamma correction before display.
So I use now a Adjust.gamma free solution…