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RelightLab 2026.01, released by the Visual Computing Lab at ISTI–CNR, is an open-source Windows application that equips archaeologists, conservators, and digital-heritage specialists with a complete Reflectance Transformation Imaging (RTI) workflow. Built around the Relight library, the software captures sets of photographs of an object lit from varying angles, calculates per-pixel reflectance functions, and compacts them into a single relightable image file that can later be interactively re-illuminated on screen. Users place the subject on a stationary support, shoot a sphere or two-scale calibration target alongside it, and let RelightLab automatically detect highlights, register camera positions, and generate a Polynomial Texture Map (PTM) or Hemispherical Harmonics (HSH) representation that reveals surface details invisible under fixed lighting. The viewer component then allows real-time dragging of a virtual light source, adjustment of specular enhancement, normal visualization, and multi-spectral decoding, making it easy to document tool marks, inscriptions, brush strokes, or fabric weaves. Because the resulting RTI files remain lightweight and archivable, the tool is equally suited to museum cataloging, forensic ridge-pattern analysis, numismatic study, and classroom presentation. Version 2026.01 refines the dome-calibration wizard, adds batch processing for large photo sequences, and introduces 16-bit per-channel export for high-dynamic-range captures, while still maintaining backward compatibility with projects created by the earlier 2024 release. Both editions are available as stand-alone installers or portable archives and run on 64-bit Windows 10/11 without additional licensing. RelightLab is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version, and supporting batch installation of multiple applications.
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