Currently using Unity 2018.3.12f1, target is PC. If I have a 1K texture that is RGBA, it remains 1.3MB on both high and medium quality compression. If I have a 1K texture that is merely RGB, it begins as 0.7MB but jumps to 1.3MB after moving it from medium to high quality compression because it has to have an alpha channel with that compression format (RGB(A) Compressed BC7). Is there really no high quality compression format for RGB, only RGBA? Do other platforms have this problem, or only desktop?