The RAW converter Vulkan darktable outpaces its competitors with a modern node-graph-based architecture and massive use of the GPU.
Open-source photographers have access to a massive selection of RAW developers, the two best-known and most mature representatives of this category being darktable  and RawTherapee . Both are aimed at demanding amateur users and professional photographers and have an enormous range of functions.
Some time ago a RawTherapee fork named ART  saw the light of day. ART tries to make it easier for beginners and technically less-experienced users to get started. In addition, a new version of LightZone  was released a few months ago, after a gap of several years. PhotoFlow  and Filmulator  are also two interesting new programs.
This group has recently been joined by a completely new program: Johannes Hanika, the founder of the darktable project, is now working on a RAW converter, the biggest highlight of which is its processing speed. Because the tool uses the Vulkan programming interface , which was previously mainly used in computer games, he has dubbed the software Vulkan darktable, or vkdt for short. (See the “Interview with Johannes Hanika” box.)
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