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 :)
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).
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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