What it is

RawTherapee is a cross-platform raw photo processing program released as libre software under the GNU General Public License Version 3. It is written mostly in C++ with a GTK+ front-end, and it reads raw files through a patched version of dcraw combined with an in-house solution that adds support for certain camera models dcraw does not handle and improves the accuracy of certain raw files dcraw already supports. The project lives in the open-source photography ecosystem, with its documentation hosted on RawPedia and its community discussion taking place in the RawTherapee section of the pixls.us forum.

The concrete problem it solves is control over raw development. RawTherapee is notable for the advanced control it gives the user over the demosaicing and development process, which matters to photographers who want to understand and steer how a sensor's data becomes a finished image rather than accept a fixed pipeline. It develops raw files from a broad range of digital cameras, along with HDR DNG files and non-raw formats such as JPEG, TIFF and PNG. It is deliberately not an all-in-one program: the README states that peripheral features such as digital asset management, printing and uploading are left to other specialized open-source software.

Key capabilities

• Reads raw files through a patched dcraw plus an in-house solution for higher-quality support of certain camera models.
• Develops HDR DNG files as well as non-raw JPEG, TIFF and PNG images.
• Provides advanced user control over the demosaicing and development process.
• Runs cross-platform, with documented build paths for Linux, Windows and macOS.
• Ships a GTK+ front-end written mostly in C++.
• Licensed under GPL-3.0, with source tarballs published for download.
• Documented feature-by-feature on RawPedia, the project's own reference wiki.

Who uses it and how

• Enthusiast newcomers use it to broaden their understanding of how digital imaging works, reading RawPedia alongside basic color-science concepts found elsewhere.
• Semi-professional photographers use it as the raw development stage of a wider workflow.
• Professionals use it for raw development while pairing it with separate tools for digital asset management, printing and uploading.
• Users on Linux, Windows and macOS build or install it per the platform-specific RawPedia instructions.
• Community members discuss the software and share results on the pixls.us forum.

Getting started

Download a build from the RawTherapee downloads page, or fetch a source code tarball and compile it following the Linux, Windows or macOS instructions on RawPedia.

When to use it — and when not to

Choose RawTherapee when the priority is deep, explicit control over demosaicing and raw development rather than a single application that also catalogs, prints and uploads. A self-hoster or adopter must accept that those peripheral features are absent by design and must be supplied by other specialized open-source tools. The project also carries a substantial open issue count, so users should expect to consult RawPedia and the forum rather than assume every edge case is settled.