change the sky to black

Hii! I hope someone can help me, im trying to change the background in a video to a black sky, its currently pretty white and cloudy and i want it really dark/black, is there anyway i can do that?

Thankyou in advance

Can you post a screenshot of the image?

Color mask. This gives a general idea. Imagine your sky being affected instead of the roof or the grass.

Hi Rebecca, Welcome to the fcp.co forums!
There are several ways to "change the background" or even a full replacement of the sky. What works best is personal choice based on what the clips looks like, what you wish to achieve, how much time you wish to spend and many other factors.
One thing to note is which version of FCPX you are using. Latest versions have greatly improved the Color Correction effects including built-in Day to Night, Hue/Saturation Curves, etc… so a sample of the clip and what you wish to do is helpful in providing an approach. Tip: when searching for FCPX tips, use search tool filters for the last year, so you get the current version help.
In addition to the link by VTC(which is an older version of FCPX, still works, Larry J has good vids) here are a couple of more video tutorials

www.rippletraining.com/blog/final-cut-pr...ies-final-cut-pro-x/
This is good for using some color masks but leaves out shape masks to limit effect to specific portion of clip. You can apply multiple color corrections/effects/masks to a clip or portions of a clip.

Here is another Ripple Training tut on using Hue/Sat color curves


Ryan Nangle has this on using Day to Night effect


This is only a small sample of possible approaches.
Happy Editing
Hope this Helps, Greg

Rebeccagabriella wrote: Hii! I hope someone can help me, im trying to change the background in a video to a black sky, its currently pretty white and cloudy and i want it really dark/black, is there anyway i can do that?

Thankyou in advance

You should be able to put the same video clip on two layers. The top layer you use a chroma-key or luma key filter to knock out the sky. The bottom layer you can adjust brightness, contrast, saturation etc. Only the the sky will be affected in the final composition because that is your mask/matte. You might want to use cropping filters as well.