The key to green screen keying with Premiere Pro’s Ultra Key effect is preparation, accurate color selection, detail adjustment and post-optimization. First, make sure that the background color of the material is uniform and without shadows, and the video layer is positioned correctly; secondly, add Ultra Key and use the straw tool to select the key color, and fine-tune the selection if necessary; then improve the edge nature by adjusting the hue tolerance, edge refinement and color overflow suppression; finally, color correction is performed to achieve coordination and unity between the characters and the new background, thereby achieving professional-level keying effect.
It is actually not difficult to use Premiere Pro’s Ultra Key effect to make green screen keying, but to be clean and detailed, you still need to master some skills. Here are some practical suggestions to help you better use Ultra Key.

1. Preparation: Materials and Settings
Before you start, make sure your video is a clear green or blue screen, with the background color as even as possible without shadows or reflections. This is a key step. If the background is too messy, it will be difficult to clean up the Ultra Key no matter how strong it is.

- Shoot with a tripod to avoid shaking the screen
- Keep a certain distance from the background to prevent the color from overflowing
- Enough light, even brighten the background
After importing the material, place the video layer to be pinched in the "Sequence" on the upper track, and a background or other material can be placed below as a synthesis reference.
2. Add Ultra Key and select the key color
The way to find the Ultra Key effect is simple:

- Search for "Ultra Key" in the Effects panel
- Drag it onto the video layer you want to pinch
- Then see the settings options in the Effect Controls panel
Click on the "Spit Tool" and in the preview window, click on the background color (usually green or blue). This step is to tell Premiere which color to remove.
Tips: If you find that the color is not selected accurately, you can use the "Add" or "Down" tools next to it to fine-tune the selection.
3. Detail adjustment: Make the edge more natural
After you finish picking, you will find that the edges of the characters may have residual color, burrs or are not smooth enough. At this time, you need to manually adjust the parameters to optimize.
Mainly adjust these parts:
- Hue tolerance : The larger the value, the wider the color range that is cut off. Adjusting the background properly can make the background cleaner.
- Edge Refinement : Used to deal with details of the character's edge, such as hair. After checking this option, you can make the edge softer by "Edge Feathering" and "Edge Shrinking".
- Color overflow suppression : Used to remove the background color reflected on the character, especially near the background.
Sometimes manual masking is required to handle particularly complex areas such as translucent objects or fast moving parts.
4. Post-optimization: Don't forget color matching
Even if it is clean, the color incongruence between the characters and the new background will be very fake. Remember to do a simple color correction so that the characters look like they are really in this context.
- Unify tones with Lumetri panels
- Adjust brightness and contrast to match the background
- Slight shadows or blurs can be added to enhance the realism
Basically these are the steps. Ultra Key is very powerful, but the key is to flexibly adjust the parameters according to the specific materials. If you try it a few more times, you will become more and more proficient.
The above is the detailed content of how to use the ultra key effect in Premiere Pro. For more information, please follow other related articles on the PHP Chinese website!

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