Here is an interesting page on sharpening without adding halos: http://powerretouche.com/Sharpness_plugin_tutorial.htm
And another more recent one here that might be helpful: http://forum.doom9.org/showthread.php?t=171314
Here is an interesting page on sharpening without adding halos: http://powerretouche.com/Sharpness_plugin_tutorial.htm
And another more recent one here that might be helpful: http://forum.doom9.org/showthread.php?t=171314