Additive Colour | Additive color
V.ESubtractiveColorMixtureTheadditionofprimaries,asdescribedinSectionIA,isanexampleofwhatisoftentermedadditivecolormixture.Fourmethodsofadditionweredescribed,allofwhichhaveincommonthefactthatphotonsofdifferentwavelengthsentertheeyefromthesame,ornearlythesame,partofthevisualfield.Therearenosignificantinteractionsbetweenphotonsexternaltotheeye;theirintegrationoccursentirelywithinthephotoreceptors,wherephotonsofdifferentwavelengthsareabsorbedinseparatemoleculesofphotopigments,whichforagivenphot...
V.E Subtractive Color MixtureThe addition of primaries, as described in Section IA, is an example of what is often termed additive color mixture. Four methods of addition were described, all of which have in common the fact that photons of different wavelengths enter the eye from the same, or nearly the same, part of the visual field. There are no significant interactions between photons external to the eye; their integration occurs entirely within the photoreceptors, where photons of different wavelengths are absorbed in separate molecules of photopigments, which for a given photoreceptor are all of the same kind, housed within the cone outer segments.
Subtractive color mixing, on the other hand, is concerned with the modification of spectral light distributions external to the eye by the action of absorptive colorants, which, in the simplest case, can be considered to act in successive layers. Here it is dyes or pigme...