If you are extracting textures from real-world photos or 3D screenshots rather than flat 2D sheets: Quad-Point Extraction:
A texture atlas extractor blends image processing, heuristics, and UX design to recover individual assets from packed atlases. Start with alpha-based detection for transparent atlases, add connected components and contour analysis for irregular packing, and progressively handle rotation, trimming, and metadata reconstruction. Combine automatic heuristics with manual correction to achieve reliable results in real-world, messy atlases. texture atlas extractor