I set 'processing profiles' as Neutral and the image is much lighter than Camera Raw Defaults, here's the comparison(all dark-framed):
...
I would like to know how to set RawTherapee so my image would be as neutral as it was shot, because if you zoom it up to 100% you will see a lot of noise, apparently not bad pixel noise, but an ISO noise:
Neutral is a good start, RT auto levels often goes badly wrong if the original image exposure is not normal. However, I find RT neutral is very flat: low contrast, dull colors compared to camera jpeg, so you probably want to add some contrast and saturation.
I can't tell you specifically how to get the same levels you get from Camera RAW. There a LOT of knobs, and I don't fully understand how they all work and interact. So what follows is just my experience messing around with it.
On the exposure tab
The "black" control can help you bring down the stuff that is so dark it's all noise. I think just increasing this will give you something a lot closer to your Camera RAW example.
You may want to add some contrast in top area and/or L*a*b. The top one seems to affect color more.
I also like the L* "parametric" adjustment in the L*a*b section to adjust the contrast.
If sky brightness isn't even (brighter near the horizon from light pollution for example) the gradient filter can be helpful. The "black" option mentioned above works much better if the sky background is fairly even.
Detail tab
Sharpening can really make the noise stand out, you may find the results better with it turned off.
The median filter can also help with noise.
Crop tab
The vignette and lens distortion correction settings can be helpful
RAW tab
Different demosaicing algorithm may give less noise. I usually use lmmse
You can correct chromatic aberration (On the version of RT I'm using, there are CA controls on both the raw and crop tabs, I find the raw one works better, but sometimes doesn't have enough range)
There is also some kind of a border on all sides of the image, what could it be?
This is normal. The sensor includes some areas that are dark, but not fully black. How dark these borders are may depend on zoom, because some cameras do basic vignette correction in raw. By default, "active area" in CHDK DNGs includes this. If you set active area to jpeg in DNG settings, the active area will be set to the same dimensions as the jpeg, and not include this. But sometimes you can salvage a little more image by including the borders.
FWIW, you can see some images I've processed in raw therapee in the examples at
http://chdk.wikia.com/wiki/Lua/Scripts:_Fixed_Exposure_IntervalometerThe "master dark" section might also be useful.
