An image or video taken by a computer to record the visible items displayed on the monitor, television, or another visual output device. Usually, screen capture is a software process where the image is captured as it is intended to be drawn but can also include traditional recording using a camera ...

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Is it possible to change the file format of Grab.app?

I know that you can change the format used by ⌘⇧3 and ⌘⇧4 (SE answer and external source), but is it also possible to change the format of Grab.app (uses TIFF)?
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Display pressed shortcuts as an overlay on the screen

On this great Ruby on Rails screencast, every time a shortcut combination is pressed it shows up on top of the screen, and it shows up so often that I find it hard to believe it was placed by hand ...
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How to record the screen of an OpenGL application without stuttering?

I'm currently recording videos of my screen using QuckTime Player and a MacBook Pro 13" (mid-2010) in a resolution of 640x480. The application I'm recording is called Synthesia (it is a game like ...