You will find this module in correction group. In this case I just switched the module on with default values. If your lens is not recognized, you can help to get it calibrated and included. If your lens is in the LensFun database, switching on lens correction with default values should be enough in most cases. Not only it helps with geometry of the image, but more importantly it can reduce fringing due to chromatic aberration. I like to apply lens correction to all my photos. So let's start the processing: Lens correction and cropping In this case there are none, which is good. We do that with raw over-exposure indicator (located in bottom right part of darkroom screen): But we want to check overblown highlights anyway. The image was shot exposing for highlights, also known as exposing to the right. You will see them in top left corner of darkroom screen (the rest of this article works in darkroom mode): Unless you changed them, they would look like in the picture below. When we load the raw file into Darktable, the default module settings will be applied. This is a jpeg file produced by my camera with very conservative settings (click on the preview for full resolution image): If you are not familiar with Darktable, you might want to check out some introductory tutorials first – for example here, videos on Youtube, or go straight for official documentation. It was originally created using duplicate option. Once you import this into Darktable it will create a second copy so that you can compare your edits with mine.
I have also included XMP sidecar file with all edits you will see below. It was shot with Nikon D7100 on a tramping trip in New Zealand mountains. If you would like to try this yourself, you are welcome to download my original raw file. In particular it shows use of parametric masks and drawn masks. The aim is to demonstrate some of the functionality and how to apply it to a landscape image. This is an example of raw image processing in Darktable.
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