4 ms·

Looks like someone has applied an unsharp mask. Example: https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Usm-unsharp-mask.png/320px-Usm-unsharp-mask.

• theoh 11y ago
  Could also be a high dynamic range operator: they do the same kind of thing to preserve contrast across large ranges of intensity. See Larson's paper http://gaia.lbl.gov/btech/papers/39882.pdf http://gaia.lbl.gov/btech/papers/39882.pdf etc.