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FRV's Highlights inspection is not about 'recoverable highligts' (reconstruction/simulation of missing details in some channel(s) based on channels with details) but about inspection without any extra assumptions.

It is just:

  • gamma change (so more contrast in highlights, by reducing contrast in shadows)
  • Optional exposure decrease
  • Optional UniWB white balance

We do not make any assumptions about the ability of the RAW converters to restore highlights.

It might be strange, but 'Overexposure display' can give a better estimation of recoverable highligts area:

  • If only a single channel is overexposed (usially the green one, so magenta overlay in Overexposure display)
  • And the overexposed area are near-neutral in color (clouds as a good example)
  • then this area is probably recoverable in HL reconstruction.

If overexposure detector shows completely black area (all channels are over-exposed) this means unrecoverable highlights.

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Alex Tutubalin/FastRawViewer team