In addition, some applications need custom icons to represent custom document types or application-specific functions and modes in navigation bars, toolbars, and tab bars. These icons must meet specific criteria so that the iPhone OS can display them properly.
Axialis Pure Flat 2013 Toolbar Icons 44
For all icons and images, the PNG format is recommended. The standard bit depth is RGBA 32 bits (8 bits each for red, green, and blue, plus an 8-bit alpha channel). You do not need to constrain your palette to web-safe colors. You can use alpha transparency in the icons you create for navigation bars, toolbars, and tab bars. Do not use transparency in application icons because the iPhone OS will automatically create rounded corners and add a shadow. But keep in mind that the bit depth must be RGB/A 32bpp, even if you don't use transparency.
Of course, not every task your application performs is a standard one. If your application supports custom tasks users need to perform frequently, you need to create custom icons that represent these tasks in your toolbar or navigation bar. Similarly, if your application displays a tab bar that allows users to switch among custom application modes or custom subsets of data, you need to design tab bar icons that represent these modes or subsets. 2ff7e9595c
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