Colour accuracy and illumination

I am building this game and its kinda minimal with more focus being on colours. I want to know how colour accurate unity is in its toolset and what should i know when attempting to get the perfect colours for my terrain and materials.
Based on initial tests the colours on the terrain felt very off, tried turning off GI, light probes, skybox, it was still very off. I’m using URP and this game is aimed at mobile phones.