GFPGAN

GFPGAN (Generative Facial Prior GAN) is a sophisticated restoration algorithm developed by Tencent ARC Lab, designed to reconstruct high-resolution, realistic faces from low-quality, blurry, or degraded inputs. At its core, GFPGAN utilizes a pre-trained Face GAN (such as StyleGAN2) as a 'Generative Facial Prior' (GFP), which provides a rich dictionary of facial textures and structures. This is integrated into the restoration process through Spatial Feature Transform (SFT) layers, allowing the model to balance high-fidelity reconstruction with original identity preservation. By 2026, GFPGAN has solidified its position as the industry-standard 'refiner' step in automated AI pipelines, often used as a post-processing layer for Stable Diffusion and Midjourney outputs to correct facial artifacts. Its architecture overcomes the limitations of traditional GAN inversion by performing single-pass inference, making it computationally efficient for real-time applications. While newer diffusion-based restorers exist, GFPGAN's speed-to-quality ratio remains unmatched for bulk processing of historical archives and real-time video enhancement, maintaining its status as a critical tool for developers in the digital heritage and professional media sectors.