When working with green or blue screens, you often see a “halo” or colored reflection on your subject even after removing the background. These are known as “spills.” Shotcut provides two filters to fix this: Key Spill: Simple and Key Spill: Advanced.
Key Spill: Advanced – Precision Color Correction
The Key Spill: Advanced filter offers high precision for complex shots. It allows you to target specific color ranges using Hue, Chroma, and Intensity parameters to ensure your subject’s natural colors remain untouched.
When to Use
Use this if the “Simple” version is ruining other colors in your video, such as skin tones, hair, or clothing that might be similar to the background color.
How to Apply
- Apply Chroma Key First: Ensure your background is already keyed out using a Chroma Key filter.
- Add the Filter: Click the + button in the Filters panel, search for Key Spill: Advanced, and place it below the Chroma Key filter in the list.
- Fine-Tune the Settings:
- Intensity: Adjust this first to remove the primary spill.
- Hue/Chroma Ranges: Fine-tune these sliders to ensure the filter only affects the edges of your subject and doesn’t “bleed” into other parts of the image.
Pro Tip
If you still see edges after tuning, try adjusting the Distance setting in your original Chroma Key filter first, then return to the Key Spill: Advanced filter for the final cleaning.