> > Mark Roberts wrote: > > Mark Roberts replied > > > Yes, all things do look different under different light sources but > > metamerism refers to prints in which the various inks don't change > > *equally* under different light sources. The result is that a print that > > looks fine in daylight may look completely wonky under incandescent > > light (rather than just more orange overall, which your eyes would > > adjust to). > > > > Wow - thanks Mark - that never occured to me...
Just to make things even more complicated; you don't even need different light sources. It is perfectly possible to have two different pigments (or dyes) which appear identical when the coloured surface is viewed straight on, but which seem very different when viewed at near-grazing incidence. That can make it very difficult when you are trying to match the colour of one material by using a pigment or dye set which has very different properties. Take a look around an automobile interior some time, and see just how many different materials there are which are coloured. Then spare a thought for the poor paint technologist who had to come up with the colour matches.
