i tried to change colour space to linear but the drop down is greyed out and i cant do anything. it says “shared setting between multiple platforms” but that doesn’t help me.
What platform are you building to? According to this Unity course’s explanation of color space, some platforms do not support Linear Color Space, and according to this (admittedly slightly less trustworthy) article, the feature is only supported by PC, Xbox, and PlayStation, so you may just be stuck with Gamma Color Space if you’re building to a mobile platform or an older console. You can attempt to recreate the effect via shaders, but Linear Color Space is probably disabled on those platforms for a reason, that being those platforms will not run it very well.