hintauc

Deterministic region-based hint generation (DHT) and Hint-AUC evaluation for line-art colorization, from Hint-AUC: Deterministic Region-based Hint Generation for Line Art Colorization Evaluation (IEEE Transactions on Visualization and Computer Graphics, 2026, DOI 10.1109/TVCG.2026.3738401).

pip install hintauc                 # deterministic hints, pixel metrics, Hint-AUC
pip install "hintauc[perceptual]"   # + LPIPS / OpenCLIP / DINOv2 / DreamSim

import hintauc
hints = hintauc.generate_hints("illustration.png", size=64)      # image -> deterministic scribble and dot hints
color, mask = hints.at_ratio(0.10, hint_type="scribble")         # hints of the largest 10 % of the regions
evaluator = hintauc.Evaluator(metrics=("psnr", "lpips", "dreamsim"))
print(evaluator("colorized.png", "ground_truth.png"))

Command line: hintauc generate image.png --ratio 0.1, hintauc eval pred_dir gt_dir --metrics mse psnr ssim, hintauc curve pred_root gt_dir (Hint-AUC from one directory of outputs per hint ratio). Your own model as a Python function: hintauc.evaluate_colorizer(fn, samples).

Documentation, the DetFill colorization model, all checkpoints and the reproduction package: https://github.com/MADONOKOUKI/DetFill-with-DHT