any screen capture can detect 'rectangular' region

[kenny1999]

i've downloaded lots of screen capture on web, all of them work pretty the same, >.< I am urgently looking for a screen capture software that can DETECT any rectangular region, instead of detecting only buttons or application windows like most software.I don't want to use freehand or magnifier because it is time consuming to capture accurate size.

Please help me. I've been deadly looking for it for long...Please

 

[tremmor]

If were talking about the same thing. And if your using windows 7 you have a snipping tool.