There are few ways to do screen capture in Mac OS X.
Follow the steps below and you will be able to do a screen capture in Mac OS X.

• Switch to the screen that you wan to to do screen capture
• Hold down Apple key ⌘ + Shift + 3 and release all
• then use your mouse to click on the screen
• Done. You will see a picture file in at your desktop. That’s the screen capture picture.

You can also do a screen capture for a portion of your screen.

• Switch to the screen that you wan to to do screen capture
• Hold down Apple key ⌘ + Shift + 4 and release all key
• Now, You will see the mouse cursor will change to +
• You can start to drag your mouse to select the portion you wish to capture.
• Once finish, you will see a picture file in at your desktop. That’s the screen capture picture!

If you want to do a screen capture for a particular application window, you can follow this:-

• Switch to the screen that you wan to to do screen capture
• Hold down Apple key ⌘ + Shift + 4 and release all key
• Now, You will see the mouse cursor will change to +
• Press the space bar once
• You will see the mouse cursor change to a camera
• Now you can use the camera to select which application window to screen capture
• Once finish, you will see a picture file in at your desktop. That’s the screen capture picture!

It’s easy to do screen capture in Mac OS X right?
No need to open any program like Paint to paste the copy from clipboard