Color Calculations with Emphasis on Spectral Data R package colorSpec version 1.8-0 Calculate with spectral properties of light sources, materials, cameras, eyes, and scanners. Build complex systems from simpler parts using a spectral product algebra. For light sources, compute CCT, CRI, SSI, and IES TM-30 reports. For object colors, compute optimal colors and Logvinenko coordinates. Work with the standard CIE illuminants and color matching functions, and read spectra from text files, including CGATS files. Estimate a spectrum from its response. A user guide and 9 vignettes are included. Software Depends: R (>= 4.0.0) Imports: logger Suggests: spacesXYZ (>= 1.5-1), rootSolve, MASS, quadprog, rgl, spacesRGB, zonohedra (>= 0.4-0), microbenchmark, arrangements, knitr, rmarkdown, png Enhances: plyr Glenn Davis <gdavis@gluonics.com> Comprehensive R Archive Network (CRAN) Glenn Davis [aut, cre] GPL (>= 3) 2025-06-10 application/tgz https://CRAN.R-project.org/package=colorSpec doi:10.32614/CRAN.package.colorSpec