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This video (and following videos) does a nice job introducing Darktable:
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Automatic works pretty well, but you can also tweak in semi-automatic or full manual mode. Negadoctor seeks to fill the same role as Negative Lab Pro- invert and correct for color cast. It's available for Windows, Mac OS and Linux- while it's part of most linux distributions, be aware you need at least version 3.1 (3.2 is better) for the negadoctor plugin, and many distributions lag behind the latest and greatest by a few months. This also makes it easy to apply those edits to other photos. It's also "non-destructive"- all of your edits, adjustments, crops, rotates, etc., are stored in metadata files, rather than changing your source image. It's really designed for RAW development, batch processing, organization, culling, proofing, etc.
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So first, is an open source package that started as an alternative to Lightroom. Rather than continue to scatter vague references here and there, it was suggested I create a thread for it. I've mentioned Darktable a few times as a promising piece of open source software, especially with the recent addition of a module called 'negadoctor', which does a pretty fair job of inverting color film negatives.
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