Am 22.02.2015 um 20:53 schrieb KOVÁCS István: > Thanks all! > Even with highlight recovery disabled, we lose much of the details. > Perhaps a programmatic way of doing something similar to what I did > (computing some kind of (weighted) average of the original R-G-B-R > photosite values and applying that to add fake luminance on top of > 'average colour' surrounding the area) could work. > Note that an exposure correction of -1EV combined with 'reconstruct > color' brings out reasonable detail, though the previously blown-out > part is still *much* brighter than anything around it.
Maybe you can have a look at PR 866 and see if the added white point adjustment parameter can do what you need. I have more concerns with our ability to reconstruct color information. We use an impainting algorithm which works quite well on skin tones but is not as good as RT color propagation. We could either port the RT algorithm or find something different ourselves. One idea: if we can identify overexposed highlights later in the pixelpipe (e.g. by L > 100) we could do the following. A good source for the right color would be non-overexposed pixels which are spatially close-by and which have a similar L value (we might need to combine this with some kind of white point adjustment for the highlights). Getting the right color estimationg could be a task for some kind of bilateral filter. > > Now, any idea about the behaviour of the colour picker (being > unaffected by the highlight recovery method, and also displaying lower > L value for the visually brighter spot)? That's not a problem of the color picker. If you look at modules in the Lab color space: they have the same paradoxical effect in the L value (you can inspect those values with the color picker in parametric masks). I assume that this is one of the many not-so-obvious characteristics of the Lab color space. Ulrich > > Thanks, > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
