Nice idea :) Use pink highlights as an indicator of over-exposedness and fix the color later.
Ulrich Am 22.02.2015 um 20:36 schrieb johannes hanika: > there's a stupid trick you could try (see attached xmp). i learned it > from this mailing list, i think from david vincent jones iirc.. > > -jo > > On Mon, Feb 23, 2015 at 8:14 AM, Ulrich Pegelow > <ulrich.pege...@tongareva.de <mailto:ulrich.pege...@tongareva.de>> wrote: > > Hi, > > yes, I also can confirm that RT really excels in highlight > reconstruction and is ahead of darktable (*). IMHO this has two aspects: > > 1) RT controls all this from one single panel. So there are only few > clicks needed to get to the desired result. > > 2) Color reconstruction of blown-out highlights works very well. > > I think the first aspect is a question of UI philosophy. Highlight > reconstruction involves different steps (dealing with clipped channels > in pre-demosaic, negative exposure correction, color reconstruction) > which in the case of darktable involves different modules. I think there > are good arguments for our way of working. > > The second aspect is certainly something we need to work on. RT has a > method called "color propagation" which seems to work better than our > "color reconstruction" (which already has been a big step forward). > > I am not sure if we can get much better within the current "highlight > recovery" module - maybe this is job for a separate module that works on > demosaiced data. > > Ulrich > > (*) Driven by the example image provided by Istvan I have worked a bit > on the shadows&highlights module. You can find my work in PR 866. This > further helps in correcting blown out highlights but still lacks a > convincing color recovery. > > Am 22.02.2015 um 19:28 schrieb Markus Jung: > > Am 22.02.2015 um 19:18 schrieb KOVÁCS István: > >> I've tried dcraw -E (just dump the raw pixels without > >> demosaicing/highlight recovery etc.), then used a 2x2 convolution > >> matrix in the Gimp to join the 2x2 R-G-B-R blocks into a single > pixel. > >> The result is at > >> > http://tech.kovacs-telekes.org/files/DSC_4684/DSC_4684-dcraw_-E.jpg - > >> lots of highlight details are available, but I have been unable > to get > >> usable highlights from either darktable, digikam, dcraw (used -b 0.5 > >> to reduce exposure by 1EV, and tried all highlight recovery modes of > >> dcraw). > >> > >> Anyone? > > > > I tried to recover them with darktable, too. The best results > have been > > archived by using the new highlight recovery mode "reconstruct color" > > but RawTherapee did a noticeable better job. > > I guess darktable lacks some more enhanced highlight recovery > algorithm. > > Maybe one of the devs will notice your example and has some more > ideas. > > > > Regards, > > Markus > > > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
