Color Grading With Gradients In FCP X

"Using color gradients to affect the color grade of our video images is a really neat trick to know about. It helps a lot when you need to tone down or brighten up a sky but not the landscape below it, when you need one area effected with tint and luminance but not others. You could always use a matte, but that could get complicated in some situations. The following 3 step technique will come in handy for not just fixing things, but enhancing the emotional content of your video images."

I can't find a way to post the link or plain url because it makes the post invisible. Ugh.

www (dot) macprovideo (dot) com/hub/final-cut/color-grading-gradients-fcp-x