It’s only available for Bayer sensors (that is, it’s unavailable for Fuji X-Trans). Most of the time it’s not much good, and is very slow.
https://darktable-org.github.io/dtdocs/en/module-reference/processing-modules/highlight-reconstruction/
The one in filmic is not really about recovery, but rather about ensuring a smooth transition. It does not know what pixels are clipped at the sensor level; rather, it uses the filmic white relative exposure as the threshold.
https://darktable-org.github.io/dtdocs/en/module-reference/processing-modules/filmic-rgb/#reconstruct
2 Likes