How to Create High-Quality Transparent PNGs Without Green/White Halos

# How to Create High-Quality Transparent PNGs Without Green/White Halos Creating a professional cutout of a subject (portrait, e-commerce product, pet, or vehicle) requires more than just erasing solid background pixels. Amateur cutouts often suffer from jagged pixelated edges or distracting white/green halos (color bleed) around hair, fur, and semi-transparent glass. --- ## 1. What Causes Edge Halos? When an object is photographed against a backdrop, light reflects off the background onto the edges of the subject. This optical phenomenon is called **Color Spill** (or chromatic contamination). * If you merely apply a binary mask (opaque vs transparent), the reflected background color remains trapped on the edge pixels. --- ## 2. The 3 Steps to a Perfect Transparent Cutout 1. **Continuous Alpha Matting ($0.0 \le \alpha \le 1.0$)**: Rather than hard edges, use gradual fractional alpha transitions on complex details like hair strands and lace. 2. **Color Spill Decontamination**: Neutralize background color tint on boundary pixels while preserving the subject's true foreground hue. 3. **Sub-Pixel Edge Feathering**: Smooth the transition contour across a 1–2 pixel radius. --- ## 3. Exporting Transparent Cutouts in Lumino Use the [Lumino AI Background Remover](/en/remove-background) to automatically isolate subjects, decontaminate color spill, and export lossless transparent PNGs right inside your browser.