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Technical Q&A QA1681

Viewing iPhone-Optimized PNGs

Q:  When I build my iPhone OS application, Xcode optimizes the PNG files within my application's bundle, meaning that Preview can't display them. How can I view these optimized files?

A: When I build my iPhone OS application, Xcode optimizes the PNG files within my application's bundle, meaning that Preview can't display them. How can I view these optimized files?

This optimization is done by the pngcrush tool, which you can find in /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush (assuming you installed the iPhone SDK in the standard place). In iPhone SDK 3.2 and later, the pngcrush tool supports a command line option, -revert-iphone-optimizations, that undoes the optimizations done during the Xcode build process. So, to view an optimized PNG file, you should first undo the optimization and then open it with Preview.

Listing 1 shows how you can use the pngcrush tool to convert an iPhone-optimized PNG file (Local.png) to a standard PNG file (Local-standard.png).

Listing 1  Undoing iPhone PNG optimization

$ /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush \ -revert-iphone-optimizations -q Local.png Local-standard.png
 

 

 

批量将优化后的PNG文件转换为正常可预览的PNG文件:

/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush -revert-iphone-optimizations -d outdir *.png

posted on 2012-03-21 09:39 不及格的程序员-八神 阅读(...) 评论(...) 编辑 收藏