pymatting/pymatting

Health v2 · maintenance only

Adoption not part of the score

1914 stars · 225 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

PyMatting is a Python library for alpha matting that estimates an alpha matte from an input image and a hand-drawn trimap to extract foreground objects. It implements multiple matting algorithms, foreground estimation, fast KNN search, and GPU-accelerated (CUDA/OpenCL) computation.

Use cases

• cut out a subject from an image given a trimap
• estimate the alpha channel of a foreground object
• extract foreground pixels from a photo for compositing onto a new background
• compute alpha mattes with GPU acceleration
• compare alpha matting algorithm implementations in Python

When to choose

• you have a trimap and need high-quality alpha matte estimation in Python
• you need multiple matting algorithms (closed-form, KNN, random walk, etc.) in one library
• you want GPU-accelerated foreground estimation via CUDA or OpenCL
• you need a simple cutout function for image editing pipelines

When to avoid

• you need automatic background removal without a trimap
• you work outside Python or need a standalone GUI tool
• you need real-time video matting at high frame rates

Facets

library · maturity active

image-processing machine-learning image-processing computer-vision graphics python cross-platform alpha-matting trimap foreground-extraction cutout image-segmentation numba cuda opencl gpu

Member repositories

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markdown · JSON · MCP: product_card(name="pymatting/pymatting")