Enfuse

What Enfuse is

Enfuse is a free command-line program that combines different exposures of the same scene into an image without first creating an HDR image. It uses the Mertens-Kautz-Van-Reeth exposure fusion algorithm, evaluating pixels by exposure, saturation, and contrast. Command-line options let users adjust the relative weight of each criterion. Enfuse can also blend focus stacks to produce images with extended depth of field. Input images may use zero-valued alpha pixels to exclude selected areas; without an alpha channel, all pixels are processed. Documented output options include compressed TIFF and JPEG, with JPEG compression values from 0 to 100. An image cache can shift image data between memory and disk. Hugin uses Enfuse for exposure fusion of bracketed image stacks, and the documentation also lists LR/Enfuse and digiKam as related workflows. Enfuse is available for Linux, macOS, and Windows, and the Enblend project that includes it is listed under GPLv2. The documentation notes that contrasty structures near the zenith or nadir of an equirectangular image can create a vortex artifact.