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I would like to know if there is a systematical way (software) to capture a fixed region on the screen, under Windows 7 or OS X.

It must be accurate about the region. I always want to capture the region with left-top coordinate (300, 300) and right-bottome coordinate (800, 800).

So I can't not select the region by mouse myself. A software to do this capture should let me to input the 2 coordinates.

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up vote 3 down vote accepted

PicPick should do this, and has some other decent options as well as good markup tools. As a bonus, it's totally free for non-commercial use.

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The added advantage of PicPick is that it is available as a portable to be carried on USB – Simon Dec 14 '12 at 18:20
@Simon - I actually never realized that, there's another point for it. – Shinrai Dec 14 '12 at 18:23
I thought it might be helpful to mention, as I totally agree PicPick is an excellent utility. – Simon Dec 14 '12 at 18:33

I use ScreenHunter. They have a free version, and an evaluation of the pro version. I'm not sure whether your specific needs are met by the free one (I've been using pro for a while), but the pro one definitely has that feature.

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CamStudio is open source and free for personal or commercial use. It allows specifying a screen region and many other options.

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In terms of Apple Mac Screen Capturing Tools, SnagIt is a very powerful application (all be it not free, however does offer a free trial to test out)

In terms of free tools for Apple Mac, I only know that Skitch (bought out by Evernote) was a powerful tool, that may accomplish your needs:

SnapCrab for Windows is a freeware alternative to SnagIt which includes many of the features and none of the cost.

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