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I imported my artwork in the simulator and this is how it looks like:
The alpha channel is not honored in the simulator.
The pnb is made on a win xp machine in Photoshop and imported
on a mac.
Is this only a simulator issue? I don’t have a device to test.
In case its not simulator specific, what should I do to improve the png quality?
This will also happen on devices too. The phenomenon is called ‘colour-banding’, caused by the limited number of bits used to represent each colour channel, and affects all images but especially images with slow gradients. You can lessen the effects by applying some dithering algorithms (I believe that the TexturePacker tool has some post-processing dithering capabilities). See this article for an example of the effect of some dithering algorithms.