ISO 9241-306:2018 shows colorimetric methods for output optimization of displays and projectors at work places. The optimization by equal spacing of colour series, visibility and readability is intended. There are input linearization methods for scanners and photography and output linearization methods for displays, printers, and offset print. By a start output of a "digital" ISO-test chart with 729 colours (9x9x9 rgb* values) for example the loop "ISO-standard file -> ISO-print -> ISO-scan -> ISOfile" is closed and the rgb* colour data of the original ISO-file are approximately reproduced at the end of the loop. For any hue there is a linear relation in both directions between the rgb* and the CIELAB LCh* data. The closed loop and the linear relations are important properties for archiving.
Klaus Richter, "Colorimetric scan, display, and print for archiving based on the ergonomic International Standard ISO 9241-306:2018 at work places" in Proc. IS&T Archiving 2019, 2019, pp 111 - 112, https://doi.org/10.2352/issn.2168-3204.2019.1.0.25