Adding PNG images to dialogs

[Sheri_Steeves]

I've updated some of the IA branded images on the dialog theme Aero to our company icon, and added another image along the bottom. Both are PNG images and the results look jaggy when the install dialogs are displayed.

Both images are larger than the actual area; would regenerating at the matching size them help with the appearance?

[FrancescoT]

Of course, the image size should be as closer as possible to the actual control area.