william writes ... > ... > > ...does this mean that L*a*b covers near infra-red and > near ultra-violet which the human eye can percieve, if not 'see'? It is > these 'invisible' colours that have a profound influence upon the brightly > coloured part of the visible spectrum. Think flowers in noonday sunshine.
UV on flower petals is a different ballgame. Such phenomena is due to absorption of UV and re-emmission of color of a different wavelength. It is not pure reflectance, as is ink on paper (... although I suppose UV enhanced papers may be an exception). > BTW, the visual world is made up of an infinite number of colours - much > more than the 16 million colours within a 24bit colourspace. ... Keep in mind as well ... percieved color cannot be described (modeled) by a 3-dimensional matrix of choices (a cube, which is RGB), and colors which are a part of reality are some shape within the "box", with much of the remainder being wasted RGB options. I run into this a lot because of trying to synthesize presentation of scientific imagery. Such pseudo-coloring generates much more "out-of-gamut" color than those who work with real world photography will ever see (and I don't mean "out-of-gamut" with respect to printing. ... I mean out-of-gamut with respect to the color space I might be working in). You may be correct with respect to some RGB color definitions being outside of human perception ... it seems I do remember Bruce Fraser saying there is no such color as 0,0,255, no matter which color space. cheerios ... shAf :o) Avalon Peninsula, Newfoundland www.micro-investigations.com =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
