Darktable+G3: Weird colors

Discussion in 'Image Processing' started by jbxberg, Apr 2, 2016.

  1. jbxberg

    jbxberg Mu-43 Rookie

    Dec 16, 2011

    Is there anybody else processing G3 RAW images with Darktable? I got tired of switching to my Windows partition to edit images, so I decided to give Darktable a thorough try (been using Lightroom 4 before). I'm using the current version 2.0.2. There are some issues I'm currently trying to solve:

    1. The default color matrix for the Lumix G3 seems somewhat off. I do realize Darktable generally gives more saturated colors than LR by default. However, some (however not all) blue tones come out extremely oversaturated and shifted towards purple. Darker denim for instance looks extremely unnatural. In the example images, look at the figure and the middle blue stripe of the cloth.

    2. Noise reduction: I had no idea how much noise LR filters out by default. I tried all the suggested methods for NR in darktable (profile wavelet + non local means, manual, equalizer), however I can only seem to reduce the noise ever so slightly. After that, the noise's appearance just changes and weird artifacts are introduced.

    3. Chromatic abberations: This correction is an on/off switch in DT. Not effective at all in many cases. Any suggestions which software could be used for that instead?

    Anybody wants to share their DT processing secrets with me? :) 

    Last edited: Apr 2, 2016
  2. CharlieL

    CharlieL Mu-43 Veteran

    Aug 2, 2014
    Burkburnett Tx USA
    I use Darktable a lot but not with a G3. I use it with both Olympus and Panasonic cameras.

    I do not really know what I am doing, I just like to putter around.

    I am not sure about what to say about the color. It looks like to me that playing with the b part lab tone curve might help with the blue/yellows.

    I have had the best luck with the denoise profiled module for noise reduction.

    The chromatic aberrations module seems to help in the something with a hard line against bright sky situation, but that is about it.
  3. tkbslc

    tkbslc Mu-43 Legend

    Might Try digikam or rawtherapee, too.
  4. jbxberg

    jbxberg Mu-43 Rookie

    Dec 16, 2011
    Thanks! Just gave RawTherapee a shot, and indeed the colors do look more realistic. Noise correction seems more effective, too. :thumbup:
    • Like Like x 1
  5. junkyardsparkle

    junkyardsparkle haunted scrap heap Subscribing Member

    Nov 17, 2016
    like, The Valley
    A good way to get a less cartoonish color rendering in darktable is to disable the 'base curve' module and then replicate (or adjust to taste) the tonal rendering using the 'tone curve' module. The difference is that 'base curve' feeds its output to the 'input color profile' module, so directly influences initial rendering of color, whereas 'tone curve' does its work later in the processing chain, after the input color profile has been applied. If the above method produces colors that are *too* boring, you can split the difference between the two modules, applying a gentle base curve to get the degree of color punch you want, and doing the rest of the tonal work with 'tone curve'. Once you have a setup that you like, you can make it the default for a given camera's files by creating presets and setting them to auto-apply.

    For detailed control of specific colors (such as trying to replicate OOC rendering) the 'color zones' module is very versatile.
    • Like Like x 2
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