It's hard to overstate the power of the tone equalizer module in darktable: it can perform tone adjustments on the whole image or only a certain luminance range and preserve details throughout the process. This module has a lot of options, which can seem intimidating at first (especially if coming from Adobe Lightroom), so let's look at several example images to see how to use it.
At first glance, the flower above might look fine. However, there is a hue shift going on which makes the flower look green/yellow even though it should be an orange/yellow. This phenomenon is present on a huge number of the JPEGs generated on-the-fly (also know as out-of-camera JPEGs) from smartphones and other devices.
ZFS datasets are a powerful and flexible organizational tool that let you easily and quickly structure your data, monitor size over time, and take backups. Learn more about how to create and manage ZFS datasets in this article.
When developing a photo, you may want to change the color of an object or set of objects in a scene while not altering other parts of the image. In this example, the autumn colors were just starting to change but would have appeared much more dramatic a week or two later. Let's show how we can use darktable with a couple of different methods to shift the scene to this later, more dramatic time period.
Using a circular polarizer and knowing how to selectively enhance contrast with the local contrast module can make reflections stand out and give an image a much more dramatic look.