Compress a texture.

Use this function to explicitly compress a texture into specified format.

If you want to do texture compression in-game, use Texture2D.Compress function, which will use faster but lower quality DXT compression.

	// Automatically Compress all imported textures to the project
	// to RGB24
	class MyTexturePostprocessor extends AssetPostprocessor {
		function OnPostprocessTexture (t : Texture2D) {
			EditorUtility.CompressTexture(t, TextureFormat.RGB24);
		}
	}