: How can I fix jagged iOS buttons created in Photoshop I'm creating buttons for my app specifically for the iPhone 4S and the iPhone5. For some reason, any objects that are circular in nature
I'm creating buttons for my app specifically for the iPhone 4S and the iPhone5. For some reason, any objects that are circular in nature appear jagged on the phones. For example, a location marker which I created in Photoshop doesn't look jagged from within Photoshop.
However, when exported as a .png and used as a button in iOS, the edges around the curve of the location marker are jagged. Is this a problem with the resolution?
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I'll take a guess that you're exporting as PNG-8 with a small number of colors, which chops off any pixels below a certain transparency and leaves the resulting image strongly aliased (the technical term for "jagged"). PNG-8 only has one level of transparency; it's an all-or-nothing proposition, but using a high value for the number of colors can give an acceptable result, depending on the background.
Use PNG-24 to achieve smooth anti-aliasing. This is what is recommended in the Apple iOS Human Interface Guidelines.
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