maybe the `color mapping' module would do the histogram transfer trick. at
least the tech in it is exactly what you would need.
-jo
On Tue, May 28, 2013 at 5:23 PM, <[email protected]> wrote:
> Here's my attempt. The base curve gets the histograms pretty close, and
> the velvia module boosts the midrange saturation to approximately that of
> the preview jpeg.
>
> As for whether there's an "easy way"... maybe somebody will write a nice
> histogram solver some day, but my method is to snap a screenshot of the
> sample jpeg's histogram and pin it up next to the "live" one for reference
> while tweaking the curve, it's a lot easier than flipping back and forth.
> For whatever that's worth...
>
> Cheers!
>
>
> On 2013-05-27 [email protected] wrote:
> > I've been using darktable for a month or two and in general I feel I
> > can find my way around it and get good results for my photos, but every
> > so often I get stymied in processing a particular picture and can't get
> > what I feel are good results. This is especially frustrating to me when
> > the out of camera JPG rendering seems to be a decent starting point and
> > I can't even duplicate that.
> >
> > Consider the following NEF and embedded preview image:
> > http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_1026.NEF
> > http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_1026-preview4.jpg
> >
> > (The preview is generated using a version of the Nikon 'neutral' picture
> > style that increases the sharpening and reduces the contrast slightly.)
> >
> > I was unable to get a result that didn't blow sections of the sky
> > out while still keeping the foreground light enough (and maintaining
> > contrast). Several experiments wound up with the sky too dark, too
> > contrasty, or both. I could probably have fixed this with sufficient
> > use of masks, but I think that I'm missing something in basic curve
> > processing. And in general I'd like to work out a relatively easy and
> > fast way to get to a starting point similar to the preview JPEG; the
> > preview image still needs work and so if it'd take me a lot of work to
> > get even there, the photo probably isn't worth it at all.
> >
> > (In general I've found that the darktable base curve(s) are often much
> > more aggressive about blowing highlights than I'd like. My attempts to
> > fiddle with the normal Nikon base curve to fix this have generally been
> > unsuccessful. I've had more luck resetting the base curve to linear and
> > then applying the 'med contrast' tone curve preset, but even that's not
> > fully there.)
> >
> > Thanks in advance to anyone who feels like taking a shot at this.
> >
> > (I should mention that I'm currently using the git tip version of
> > darktable.)
> >
> > - cks
> > PS: I know that this is not a great picture in general but I think it
> > makes a good illustration of the disconnect between the camera
> > preview image and what I can achieve in darktable with my current
> > understanding (probably better than a better picture, honestly).
>
>
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