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Raw photo editing with RawTherapee

Submitted by Roy Schestowitz on Thursday 17th of February 2022 11:49:18 PM Filed under
Software

Digital photography opens up a whole new world of photo postprocessing opportunities, especially if the photographer uses their camera's raw format to take advantage of all of the data collected by the sensor. On the other hand, using raw images means doing without all of the processing done by the camera and taking on a range of complex tasks. Raw photo editors are designed to work with raw images as a key part of a photographer's workflow. Your editor recently reviewed the darktable editor, but there are other options available in the free-software community. RawTherapee is a GPLv3-licensed raw editor that is in some ways simpler than darktable — but that is not the same as saying that it is simple.

Superficially, RawTherapee looks a lot like darktable. The initial view is called the "file browser"; like darktable's "light table", it allows the user to import images into the application, add star ratings, and choose an image to edit. There are options to filter images in a number of ways, including by aperture and shutter speed, or by the lens that was used to take them. The right sidebar can also be turned into an inspection window for quickly looking at images using a 1:1 pixel ratio to check for focus.

As an experiment in processing photos with RawTherapee, your editor used the file browser to choose the image shown below, taken on a recent outing above town. Once again, this photo is anything but a great work of art, but it does show the kind of problems that a raw editor can address. The image contains a lot of contrast, and the mountains in the background are somewhat overexposed — an ongoing hazard when photographing scenes with snow in them — while the foreground is dark. What is shown here is the image as produced by the camera; what can be done to improve it?

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