Aliasing is a video artifact where edges appear jagged or “stair-stepped.” This often happens when the camera sensor struggles to capture fine details—especially with small sensors like those in action cameras. High default sharpness settings and compression artifacts in cameras like GoPro can make aliasing worse.
How to Reduce Sharpness in Post-Production
1. Using Gaussian Blur (Traditional Method)
One classic way to reduce aliasing is by applying a light blur.
In Adobe After Effects:
Go to Effect > Blur & Sharpen > Gaussian Blur and set the Blurriness to around 2.
This softens jagged edges, though it may also reduce overall detail.
2. Using FXAA Plugin (Modern Method)
FXAA (Fast Approximate Anti-Aliasing) is a free plugin that intelligently detects and blurs only harsh edges—reducing aliasing without softening the entire frame.
In After Effects:
Apply Effect > Plugin Everything > FXAA.
You can stack the effect multiple times if needed for stronger results.
Adjusting Camera Settings
1. Use Protune Settings (for GoPro and similar)
Enable Protune mode to manually control ISO, white balance, and sharpness.
Set Sharpness to “Low” or “Medium” to achieve more natural footage and reduce harsh edge artifacts.
2. Lower the Sharpness Setting
Default sharpness levels on many action cams are too high.
Setting sharpness to “Low” or “Medium” (instead of “High”) results in smoother and more cinematic footage with less aliasing.
Additional Tips
- Shoot in Good Lighting: Low light can introduce noise, which worsens visual quality. Always shoot in well-lit conditions if possible.
- Use Stabilization Tools: Tools like Warp Stabilizer in Adobe Premiere Pro can enhance the professional look by smoothing out shaky footage.
- Use UV Filters and Frame Mounts: These help minimize lens flares and protect your camera, resulting in cleaner footage.
