iphone:Creating-custom-icons-and-images
出自UXGuide.net
创建自定义图标和图像
Creating Custom Icons and Images
The user interfaces of iPhone applications are characterized by beautiful images and lush color. As an application designer, you want to fit into this environment by providing an aesthetically pleasing user interface. Although iPhone OS provides a wide range of elegant and attractive user interface elements, there are two custom elements every application needs: an application icon and a launch image. In addition, applications should provide a small icon for iPhone OS to display in Spotlight search results.
精美图像和丰富的颜色是 iPhone 应用程序的用户界面的特征。作为应用程序设计师，你应当提供赏心悦目的用户界面以融入这个环境。虽然 iPhone OS 提供了大量精美而引人注目的用户界面元素，但每个应用程序仍然需要两个自定义元素：应用程序图标和启动图像。另外，应用程序应当为 iPhone OS 提供用于显示在 Spotlight 搜索结果中的小图标。
Some applications need custom icons to represent application-specific functions and modes in navigation bars, toolbars, and tab bars. When you follow the guidelines for creating these icons, you can achieve results that both harmonize with the built-in icons and subtly accentuate your application’s style.
有些应用程序需要自定义图标以在导航栏、工具栏和标签栏中表示特定的功能和模式。只要遵照创建这些图标的准则，你即可既与内置图标保持和谐，又能够适当强调你应用程序的风格。
Note: The standard bit depth for icons and images is 24 bits (8 bits each for red, green, and blue), plus an 8-bit alpha channel. The PNG format is recommended, because it preserves color depth and supports an embedded alpha channel. You can use the Preview application to produce the final PNG file.
注：图标和图像的标准位深是 24 位（红、绿、蓝各 8 位），加上 8 位的 Alpha 通道。推荐使用 PNG 格式，因为它可以保持色彩深度并内置支持 Alpha 通道。你可以使用预览程序来处理最终的 PNG 文件。
You do not need to constrain your palette to web-safe colors. Although you can use alpha transparency in the icons you create for navigation bars, toolbars, and tab bars, do not use it in application icons.
你无须将颜色限定在 Web 安全色内。虽然你可以为导航栏、工具栏和标签栏上的图标使用 Alpha 透明，但不要在应用程序图标中这么做。
