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? Thanks, Kofa On 18 February 2015 at 23:18, KOVÁCS István <k...@kovacs-telekes.org> wrote: > Hi, > > I've uploaded a couple of files to > http://tech.kovacs-telekes.org/files/DSC_4684/ > > DSC_4684.NEF is an image where a guy wears a wig (it was a fun 'retro > disco' party). No matter what I do, I can't restore the highlights on > the blown parts. > DSC_4684-rt-denoise-on.jpg shows what RawTherapee did. (-off is the > same, without its denoising turned on) > DSC_4684.jpg is my best darktable result, but I had to cheat and use > 'colorize' on the blown out part to add colour. > Any advice is much appreciated. > > Now, as to the potential bug: > I opened the file again, cleared all modules except for those shown > (those that can't be disabled + exposure and orientation), applied a > -1EV correction. > http://tech.kovacs-telekes.org/files/DSC_4684/samplers1.jpg shows two > 'live' colour samplers (area, Lab mean). The blown-out part has a > lower L value than the other, darker part. > Switching from 'reconstruct color' (samplers1) to 'clip highlights' > changes the image dramatically, but the displayed samplers remain the > same. It seems to me that the highlight sampler shows the 'clip > highlights' value, as it has a purplish tint. > You can see something similar if you open the tone curve tool: > sampling inside the clipped highlight will give you an L value around > 76, and inside the darker path around 80. > > Cheers, > Kofa ------------------------------------------------------------------------------ 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
