Everything you need to know about Alpha Threshold
Alpha Threshold converts semi-transparent pixels to either fully transparent or fully opaque based on a cutoff value. This is perfect for cleaning up PNG masks, creating crisp sticker-style cutouts, or removing unwanted semi-transparent halos around images.
Parameters
- Strength
Controls how much of the threshold effect is applied. At 0, no change occurs. At 1.0, the full effect is visible. - Threshold
The cutoff point for transparency. Pixels with alpha below this value become transparent; pixels above become opaque. A value of 0.5 means 50% transparent pixels are the dividing line. - Softness
Controls the transition between transparent and opaque. At 0, the edge is perfectly sharp (hard cutoff). Higher values create a gradual fade, which can reduce jagged edges. - Invert
Swaps transparent and opaque areas. Useful for quickly reversing a mask or selecting the background instead of the subject.
Tips
- Use a low threshold (0.1–0.3) to remove faint semi-transparent halos
- Add slight softness (0.01–0.05) to avoid harsh, pixelated edges
- Great for preparing images for print or platforms that don't handle semi-transparency well