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For the purpose of recording some scenario on my screen in 720 HD format, I would like to set the window of a particular application to the exact size of 1280x720 pixels. With some patience, I managed to resize it manually to the required size. Is there a better way to achieve this? I am on MountainLion.

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As far as I'm aware, there is no inbuilt functionality in Mountain Lion to do this.

I use an application called SizeUp which allows you to do what you're asking. Here is part of the preferences dialog:

enter image description here

It's also handy for stretching windows fullscreen, unlike the green icon on the top left of each window, which behaves differently per app!

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Thanks, this does exactly what I was looking for. – Reinier Torenbeek Oct 18 '12 at 4:28

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