//el metodo
void GeneratePalette()
{
Color32[] AllPixels = tex.GetPixels32();
var pathname = EditorUtility.SaveFilePanelInProject("Save Palette Asset as...", "Palette_xxx", "asset", "asset");
//string pathname = AssetDatabase.GenerateUniqueAssetPath("Assets/Resources/" + tex.name.ToString() + "_Palette" + ".asset");
SO_Color2Prefab tempAsset = CreateInstance <SO_Color2Prefab>();
AssetDatabase.CreateAsset(tempAsset, pathname);
for (int i = 0; i < AllPixels.Length; i++)
{
tempAsset.color2prefab.Add(new Color2Prefab(AllPixels[i]));
}
tempAsset.Clean();
AssetDatabase.SaveAssets();
AssetDatabase.Refresh();
EditorUtility.FocusProjectWindow();
}