The UV blur can be essential depending on the way your video camera stores its data.
After keying some video you may notice a pixellated ‘stepping’ around the edge of the key. If this occurs, add a chroma UV blur before the key itself. This will help to smooth out the edge. YUV color separates the luminance of each pixel (Y) from the chroma data (UV) Blurring only the chrominance data smooths the edges without losing the contrast detail which defines the edge location.
- Radius: Controls the amount of blur, defined as a radius in pixels.
- Direction: Select how the blur is applied.
- Horizontal & Vertical: The blur is applied in all directions. This is the usual method used for blurs.
- Horizontal: The blur is only applied horizontally.
- Vertical: The blur is only applied vertically.