TextureModifier.OnPreprocessTexture C# (CSharp) Method

    void OnPreprocessTexture()
    {
        var importer = (assetImporter as TextureImporter);

        importer.textureType = TextureImporterType.GUI;
        importer.compressionQuality = (int)TextureCompressionQuality.Best;

        if (assetPath.EndsWith ("PVR.png")) {
            importer.textureFormat = TextureImporterFormat.RGBA32;
        }
    }