I agree, I appears that the camera is doing some additional "clever" color
adjustments besides the white balancing. This processing probably fixes the
initial bad WB, but DT has no way to find out about it. It is happening
almost all the time, even on landscape pictures in daylight. See
https://www.dropbox.com/s/7s3bpmzg7l4mzsm/Screenshot%20from%202014-01-31%2023%3A05%3A11.png
where the sky in the raw is more magenta, whereas the rocks are tinted
towards green, compared to the jpeg.
Anyway, thanks for the style. It seems that I will have to learn to live
with this.
Regards,
Stepan
On Fri, Jan 31, 2014 at 10:40 PM, <[email protected]> wrote:
> Attached is a style that illustrates how to use 'color zones' to do
> something similar to the camera's JPEG processing. It's a little more
> subtle than your JPEG (which I think looks better) but it should be pretty
> obvious how to make it more dramatic by pulling the curve around.
>
> On 2014-01-31 [email protected] wrote:
> > On 2014-01-31 [email protected] wrote:
> > >
> > > I don't think you have anything wrong; merely that the developers of Dt
> > > don't know exactly what the JPEG engine inside of our cameras does.
> >
> > Yes, this, and more so. If you look closely, you'll notice that it's not
> really a white balance issue at all, there isn't a consistent difference in
> color cast over the whole image. It's primarily the skin tones (or anything
> the camera processing engine thinks *might* be a skin tone) that have their
> red levels "enhanced"... this is something the camera applies to the JPEG
> on top of the plain old white balancing, which is not replicated by
> darktable, hence the difference in appearance. If you don't believe me,
> look at the values of a sample of the white paper object in the bottom-left
> corner for both images.
> >
> > Before I started processing raw files, I never understood why digital
> cameras seemed to have so much trouble correctly reproducing certain shades
> of orange, etc, without shifting towards magenta. I now realize that this
> is because camera makers are paranoid about producing "un-pleasing" skin
> tones, and do a lot of "magic" (and guessing about what might be an "off"
> skin tone) to keep that from happening. If you try to make the skin tones
> "pleasing" with white balance alone, the rest of the scene is thrown off.
> If you want to reproduce this effect somewhat, you can do it with the
> 'color zones' module, although exactly replicating the magic applied to the
> JPEG is tricky. There may be settings in your camera that will produce a
> more neutral coloration, closer to darktable's default ouput, but I've
> found that my Olympus XZ-1 does this "enhancement" to JPEGs even on
> 'natural' setting.
> >
> >
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