For gently 'flushing' the area to white, 'global tonemapping' is really the easiest solution. Nice!
David On 13-06-09 11:55 AM, johannes hanika wrote: > this works really well, too. i wonder if we should collect all those cool > tricks in a blog post. i prefer `global tonemapping' because it blends in > more nicely into the non-reconstructed parts. > > for clipped regions i still used the reconstruction mode of the highlights > module (to get white details which tonemapping will bring down). > > or alternatively i switched off the highlights module and used conditional > blending to grep for magenta in tonemapping/channel mixer/monochrome. > > ultimately i guess it's worth designing a convenience module combining the > best of those techniques and providing easier access. should be easy to > create those blend mask automatically from the input values. > > cheers, > jo > > > > > On Sun, Jun 9, 2013 at 8:47 AM, Markus Jung <maju.j...@web.de> wrote: > >> I have just found something which works quite fine for me, even if the >> sky is fully blown out during processing: >> >> - Process for the dark regions of your image >> - Activate the module "tonemapping" >> - Set contrast compression to 1,0 and use blendif to limit the effect of >> the module to the bright parts of the image (for example 140-255) >> - Use mask blur (for example 2.5) to prevent halos and other ugly effects. >> >> Regards, >> Markus >> >> Am 28.05.2013 23:42, schrieb Chris Siebenmann: >>> A number of darktable processing steps can push unclipped RAW channels >>> into overexposure under some circumstances (for example, the standard >>> Nikon base curve not infrequently blows highlights out on me). As a >>> relative beginner at darktable, I'm interested in people's views on the >>> best and easiest way to recover the highlights in this case. >>> >>> I think that what I want at a conceptual level is to pull the >>> highlights down (I assume inevitably reducing highlight contrast), >>> but there may be something that gives a better visual look. Things >>> I've tried, without universal success: >>> >>> * the Shadows and Highlights module often doesn't really reduce the >>> blown highlights very much (or at all) and can give me an unnatural >> look >>> (this may mean that I need to change the 'soften with' setting). >>> >>> * the Zone module also doesn't seem to be able to pull down the >>> brightness of the blown highlights, although it can be used on things >>> that aren't too bright. >>> >>> * Tone curves have defeated my ability to make good fine adjustments at >>> the bright end of the curve without screwing up the rest of the image. >>> I assume it's possible but I'm clearly not doing something right. >>> (I've tried setting the linear preset to freeze most of the 'curve' >>> and then monkey around only with the top end.) >>> >>> (I suspect that this is the right solution and what I want to do is >>> develop some sort of 'highlight recovery' preset, but it's beyond my >>> current darktable skill.) >>> >>> * the Levels module won't let me move the white point out to the right >>> (which I think might have roughly the effect I want but I could be >>> wrong about). >>> >>> Since I suspect that this sort of question always works better with an >>> example, here's a sample D7100 NEF that exhibits the sort of 'blown in >>> processing' effect that I'm talking about: >>> >>> http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_1101.NEF >>> >>> (This picture has some genuinely clipped areas, but only a small >>> number; many more blow out with the default Nikon tone curve.) >>> >>> (Note that I'm presenting this for illustrative purposes; I'm less >>> interested in how to process this specific picture than in how to >>> recover highlights in the general case that this picture is an example >>> of.) >>> >>> Thanks in advance to anyone who has suggestions, guidance, etc. >>> >>> - cks >>> >>> >> ------------------------------------------------------------------------------ >>> Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET >>> Get 100% visibility into your production application - at no cost. >>> Code-level diagnostics for performance bottlenecks with <2% overhead >>> Download for free and get started troubleshooting in minutes. >>> http://p.sf.net/sfu/appdyn_d2d_ap1 >>> _______________________________________________ >>> Darktable-users mailing list >>> Darktable-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/darktable-users >>> >> >> >> ------------------------------------------------------------------------------ >> How ServiceNow helps IT people transform IT departments: >> 1. 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