On jeudi 14 février 2019 12:23:03 CET Dusenberg wrote: > I have just been puzzling over the 'pink highlight' problem on several raws > I recently shot (not HDR), all of which have blown highlights caused by a > camera operator silly error :) I recently created a custom style for my > camera and I thought that was something to do with the problem, so I'm glad > it's a known characteristic for which a solution is available - don't > over-expose! > > I also noticed that Highlight Reconstruction was switched on on these raws > and I hadn't done it as I like to start from a blank canvas, so switched it > off. Reading the trail of replies however, it seems the only way to > fix/reduce the pink problem is to use Highlight Reconstruction - so I'm now > wondering if DT automatically switches Highlight Reconstruction on if it > detects blown highlights; does anyone know?
As far as I know, "highlight reconstruction" is _always_ automatically switched on for raw files (and never for jpeg or png files). It just has no visible effect if there are no over-exposed areas. The default setting is "clip to white", I prefer using "reconstruct in LCh", which usually gives a bit more detail in slightly over-exposed areas (clouds are a typical example). Keep in mind though, that you can get blown areas for two reasons in Darktable. First is of course over-exposure, in which case the raw data is clipped. But the basecurve that is (automatically) applied to raw files can also cause blown regions. Darktable picks a curve based on the detected camera (for the default case), and e.g. the Sony basecurve clips rather soon (at input values of about 90 on a scale 0..100). For that reason, I tend to switch to another curve (Canon or Leica, neither of which clips the highlights), or use the "filmic" module (which has a learning curve). That very often means also a correction in the "exposure" module! Remco ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
