Link: How to Disable the Window Shadow on Screen Shots in Mac OS X

screenshot-shadow---no-shadow We often use OS X's built-in screenshot tool. Unfortunately the default window screenshot always has a shadow. This not only changes the dimensions of the image but sometimes it just looks bad. Here's a quick way to disable the shadow.

http://osxdaily.com/2011/05/23/disable-shadow-screen-shots-mac/