Viewing iPhone-optimized pngs

Technical Q & A qa1681viewing iPhone-optimized pngsq: 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 byPngcrushTool, 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 sdks 3.2 and later,PngcrushTool 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 shoshould First undo the optimization and then open it with preview.

Listing 1Shows how you can usePngcrushTool to convert an iPhone-optimized PNG file (Local.png) To a standard PNG file (Local-standard.png).

Listing 1Undoing iPhone PNG Optimization

$/Developer/platforms/iphoneos. Platform/developer/usr/bin/pngcrush \-revert-iPhone-optimizations-Q local.png Local-standard.png

 

 

Batch convert the optimized PNG files to normal and previewed PNG files:

/Developer/platforms/iphoneos. Platform/developer/usr/bin/pngcrush-revert-iPhone-optimizations-D outdir *. PNG