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RelightLab 2025.12, released by the Visual Computing Lab of ISTI-CNR, is a Windows application dedicated to the acquisition, creation, and interactive visualization of Reflectance Transformation Imaging (RTI) datasets. Falling squarely into the scientific photography and cultural-heritage digitization category, the software combines a concise graphical interface with a command-line library that guides users through the entire RTI workflow: shooting a sequence of images under varying light angles, merging them into a single relightable file, and then examining surface details by dynamically repositioning a virtual light source. Typical use cases range from epigraphy and numismatics—where minute scratches or tool marks must be studied—to forensic document analysis and conservation of paintings, textiles, or archaeological artifacts that cannot be handled repeatedly. The package ships only one version, 2025.12, indicating an early but stable milestone that already supports PTM (Polynomial Texture Map) and HSH (Hemispherical Harmonics) fitting, real-time relighting with specular enhancement, normal visualization, and multi-resolution export for web viewers. Researchers can batch-process large image stacks, embed metadata compliant with the RTI format specification, and calibrate camera–light setups through an assisted wizard, while educators benefit from the built-in measurement tools that log incidence angles and surface normals for quantitative comparisons. Because the underlying Relight library is open source, advanced users can script custom acquisition rigs or integrate the viewer into larger digital-heritage pipelines. RelightLab is available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, guaranteeing the latest build and enabling batch installation alongside other applications.
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