“…As in Section 2.2.3 , the HDR images were exported as 32-bit EXR files from the TLS measurement data, and the 32-bit EXR files were converted to 16-bit TIF files, applying Python 3.6.9 with libraries OpenEXR (1.3.2) (San Francisco, CA, USA), Numpy (1.16.6) (Cambridge, MA, USA), and OpenCV-Python (4.2.0.32) (Willow Garage, Menlo Park, CA, USA). Relative luminance values were calculated for each pixel in the 16-bit TIF files applying Equation ( 5 ), and the 16-bit relative monochromatic luminance values were coded over the three 8-bit RGB channels of a respective pixel and a new image was saved as an 8-bit TIF [ 25 ]. Hence, the new 8-bit relative luminance TIF image contains a wider dynamic range than a regular 8-bit RGB image, as all three channels carry the relative luminance data.…”