This repository is a redistribution mirror of the neural-network models produced by the GraXpert project, so that Retina can fetch them without requiring a full GraXpert installation.

These models are not ours. They are the work of the GraXpert Development Team and its contributors, and they are licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) — distinct from the GPL-3 licence of the GraXpert application code. The files here are unmodified: they are the exact model.onnx extracted from GraXpert's official model archives, and their SHA-256 sums are listed below so anyone can verify that.

CC BY-NC-SA 4.0 forbids commercial use. You may download and use these models for non-commercial purposes only. If you sell prints, work on commission, or otherwise process images commercially, you are not licensed to use these models — this restriction comes from GraXpert, not from Retina, which itself places no such limit. Redistribution is permitted (and this mirror relies on it) provided attribution, the same licence, and no additional restrictions.

Retina prefers a local GraXpert installation if it finds one (its models are discovered and used in place). This mirror is the fallback for users who do not have GraXpert installed. In both cases the model actually used — its name, version and SHA-256 — is written into the processing history and the FITS keywords, so every result records exactly which file produced it.