Splash Screen Save Settings

I'm sure this has been asked before too, but what settings does John use to save his splash images. I know it uses 96dpi, I'm just wondering if he uses the highest quality available or another setting. I want to create my own splashes, and a splash template for Have Some Patience's apps, not including the PA logo, but none of them come out as clear as John's, they all have lots of aliasing. Thanks for any help.