Take a Screen Shot Without the Shadow in Mac OS X
Using Grab is the easiest for most users since it’s wrapped in a familiar GUI. Grab is located in /Applications/Utilities, so launch that and then select “Window” from the “Capture” menu:
This will bring up the familiar window selector tool that you get when you hit Command+Shift+4, but any resulting image won’t include the window shadow.
The command line approach might be preferable to other users, so here’s the syntax you’d want to use for that:
screencapture -oi test.jpg
This too will bring up the familiar window selection tool, and any resulting screen capture will be missing the shadow.
If you want the image to go to your desktop like a normal screenshot would, use:
screencapture -oi ~/Desktop/shadowfree.jpg
You can direct the output of this command to where ever you want, just specify the proper path.
Thanks to reader inket for the Grab tip!