Download Darktable 1.2

image. The most common change is fine-tuning the white balance, which is done using
the “temperature in” slider. Moving this slider left will make the color balance cooler, and
moving it right will make it warmer.
1.2.2.3. Exposure correction
The exposure module is probably the most basic module of them all. Exposure is fine-tuned
either by using the slider, or by dragging with the mouse in the histogram. You can also
boost the black level to enhance contrast; but be careful: use small amounts, like steps of
0.005. There is also an auto-correct feature.
1.2.2.4. Noise reduction
The best starting point for noise reduction is profiled denoise. This module offers an almost
“single-click” solution to fight noise. From a user perspective the effect only depends on
camera type and ISO value, both derived from EXIF data. All other settings are taken from
a database of noise profiles that the darktable team has collected - now covering already
over 70 popular camera models. In addition you have several other options in darktable
to reduce noise. There is raw denoise, denoising based on bilateral filter, denoising based
on non-local means, and equalizer, which is based on wavelets. If your camera is not yet
supported by profiled denoise, denoising based on non-local means is probably the most
convenient, as it allows you to treat color and luminance noise separately.
1.2.2.5. Fixing spots
Sometimes you will need to remove spots caused by sensor dirt. The spot removal module
is at hand and can also correct other disturbing elements like skin blemishes. If your camera has stuck pixels or tends to produce hot pixels at high ISO values, or longer exposure
times, have a look at the hot pixels module for automatic correction.
1.2.2.6. Geometrical corrections
Quite frequently you want to only show part of the captured scene in your image, e.g. to
take away some disturbing feature close to the frame. In other cases, the horizon in the
image may need levelling, or there are perspective distortions. All this can be corrected
in the crop and rotate module. If you need to correct typical camera lens flaws like cushion distortion, transversal chromatic aberrations or vignetting, there is a lens correction
module.
1.2.2.7. Bringing back detail
Digital RAW images often contain more information than you can see at first sight. Especially in the shadows of an image, there are lots of hidden details. The shadows and highlights module helps bring these details back into visible tonal values. Structural details in
fully blown-out highlights, by nature of the digital sensor, can not be recovered. However, you can correct unfavorable color casts in these areas with the highlight reconstruction
module.
1.2.2.8. Adjusting global contrast
Almost each workflow will cover as one basic element the adjustment of global contrast.
You will want to control how the image tonal values cover the available range of your
output medium. darktable offers several alternative modules to take care of that. In one
of them, the tone curve module, tonal values are adjusted by constructing a gradient curve.
The levels module offers a much simpler interface, with just three sliders. In addition, there
is a zone system module which allows control over tonal values by zones, inspired by the
work of Ansel Adams.
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