Thanks Christian! Can you also test this last preset and report whether
it's better or worse?
...
emre
On Tue, Dec 18, 2012 at 6:11 PM, Roumano <[email protected]> wrote:
> Le mardi 18 d�cembre 2012 à 14:33 +0100, Emre Meydan a écrit :
> > Hi Johannes,
> >
> >
> > If the important thing is how closely the curves follow sigma=1 in
> > "flat noise levels" graphs, then one of my earlier photo shoots
> > actually seems to be better -- the curves follow 1 more tightly with
> > less fluctuation:
> > http://emremeydan.com/tempor/550d-denoise_02.tar.gz
> >
> >
> >
> > Do you think these would work better? I can't directly compare them to
> > the other ones, because i don't know how to get both sets of presets
> > into darktable database.
> Hi,
>
> Very simple :
> add your preset (form preset.txt) to the file src/iop/denoiseprofile.c
> name them as you want, like '{N_("canon eos 550d 2 iso 100"),on all iso
> wanted then build.sh (& cd build && sudo make install) as usual.
>
> Regards
>
>
> > If these are also not good enough, i'm willing to give it one last
> > try, and shoot another set. I mean, if there's an improvement to be
> > made, it should be made :) I'm just waiting for a bit of sun, so i can
> > get high contrast and good clipping.
> >
> >
> >
> > Thanks!
> >
> > ...
> >
> > emre
> >
> >
> >
> > On Mon, Dec 17, 2012 at 10:29 PM, johannes hanika <[email protected]>
> > wrote:
> > hey
> >
> > On Tue, Dec 18, 2012 at 2:33 AM, Emre Meydan
> > <[email protected]> wrote:
> > > Hi,
> > >
> > > I know somebody else was working on a profile for this
> > camera, but i also
> > > wanted to try it myself.
> > >
> > > I had to make three different sets of shoots before i got a
> > nice profile.
> > > What i tried last (and what seemed to work) was to shoot the
> > window of my
> > > room: the sky was overexposed, while the shadows in the room
> > provided
> > > underexposure. I also exhaled on the lens for a bit of
> > extra-blur :)
> >
> >
> > good idea :)
> >
> > > I'm not sure if everything is as it should be: looking at
> > the graphs, the
> > > red channel is not clipped, and for iso 400 & 1600 the blue
> > channel also
> > > doesn't seem to be clipped (though close).
> >
> >
> > graphs look fine. iso 100 is not quite as overexposed as the
> > others,
> > so the fit is not optimal (but who denoises iso 100..).
> >
> > if roumano agrees, i'd use your values as new values for the
> > 550d.
> >
> > cheers,
> > jo
> >
> > > But after initial testing it seems to work very well. Up to
> > 400 iso the
> > > results are really good. With higher iso the profile removes
> > fine noise, but
> > > larger color blotches remain -- as other people noted. I
> > guess they require
> > > a different kind of noise reduction.
> > >
> > > One small problem i have is that, in the presets section i
> > see two different
> > > sets of presets: half of the presets are named "Canon 550D",
> > but selecting
> > > them doesn't change a thing (even though darktable seems to
> > calculate stuff
> > > when they're selected). The other half are simply called
> > "test" and they are
> > > the ones that work.
> > >
> > > You can get the resultant files here, and check if anything
> > is wrong:
> > > http://emremeydan.com/tempor/550d-noise_01.tar.gz
> > >
> > > Included is a camera-jpeg of 400iso, to show you what i used
> > for profiling.
> > > I can also send the raw files if you need them.
> > >
> > > Thanks a lot for the hard work!
> > >
> > > ...
> > > emre
> > >
> >
> > >
> >
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> >
> >
>
>
>
>
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