ScreenTaker是一个非常不错的屏幕捕捉程序，而且提供图形转变工具。

Screentaker

v1.2.5 Mac OS X | 6.4 MB

Screentaker is a small utility that makes creating nice screenshots for iOS apps easier by letting you apply effects to them. Simply drop the screenshot on Screentaker or even capture a screenshot from the iOS Simulator and choose the desired device, orientation and effect. The app is smart enough to detect the device and orientation automatically. You can also download and install effects other users have created or create your own effects.

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http://www.filefactory.com/file/2tnplxbbvt5l/Screentaker.v1.2.5.MacOSX.rar