Hi, Say if one were to produce their own target reference files... Which (metadata) fields would be important/critical to not forget, besides the obvious field data: ORIGINATOR "Pascal de Bruijn" DESCRIPTOR "L* a* b* vendor information (light D50, viewing angle 2)" MEASUREMENT_SOURCE "X-Rite ColorMunki" ILLUMINATION_NAME "D50" OBSERVER_ANGLE "2" CREATED "2010-01-31" I noticed the CGATS spec isn't available for free, but hardcopy is affordable at ~30EUR... Would it be worth purchasing? I'm particularly interested in the metadata fields... I'd appreciate any tips and pointers... Regards, Pascal de Bruijn