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I've been using shutter for this task. It is easy to setup and use.
In order to install Shutter you can use the following commands:
sudo yum install epel-release
sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-1.el6.nux.noarch.rpm
sudo yum install shutter