Loss of quality when exporting Texture2D

[Nelonn]

I exported a pretty large texture from the game and it has a resolution of only 512 by 512. How can I disable texture compression and get full resolution

[aelurum]

Good question, since AssetStudio doesn't do any texture "compression".
The size of the exported texture must be the same as specified in the preview tab.
If you want more details, you should send a unity file with this texture.