At 10:13 AM +0100 5/13/04, I G Okorji Esq. wrote: >On 12/5/04 6:55 pm, Steve Upton wrote: > >> >>> The PowerBook G4 displays 16.7million colours (combinations!) >>> so does the cinema display. >> >> not true. Again, don't confuse RGB number combinations with the number of >> perceivable colours. > >I did not say perceivable colours but displayable colours.
what might the difference be? I assure you there are not 16.7 displayable colors on your laptop display. The human eye cannot even perceive that many. When speaking in terms of color we are, by definition, speaking in terms of human color perception. Numbers in a machine are related but not the same thing. It's fair to say that what I do for a living is work on clarifying the relationship between device numbers and perceivable colors. > > >> I can send 16.7 million different RGB NUMBER combinations to a PowerBook >> display but it will only display 518,733 different colours. This means that >> 16,258,483 of the RGB numbers are basically "wasted". > >Lets take a hypothetical blue car under controlled day lighting and >photograph it, then display it in the very best of monitors (with any >necessary adjustment if you prefer), how many colours does the image on such >screen display? obviously that depends on a bunch of factors. They will all be in gamut though. > Lets take a blue card, a yellow card and a red card, place >them on a white background, again in a controlled lighting situation, >photograph them, download such image in your super computer with super >screen. How many colours do you perceive? How many colours do you perceive >or able to count count in a typical black and white photograph? I am sure if >you carryout this basic experiments it will become clear to you whether the >world is that multi-chromatic, and most importantly whether you actually >need all that extra gamut the cinema display offers if not for your "luxury" >or if this is very harsh then your "choice". I know I could do one thing. I could measure the cards and determine if their colors are in-gamut for your display. I could then setup my machine in one of two different ways and get the following results: - If I used a large enough working space to contain the colors, my camera captured them effectively (might need a camera profile for that), and then a printer with a larger enough gamut AND I had a good print profile, I could probably match the card pretty closely. It may not look saturated enough on my display but I would be aware of my display's limitations. - OR I could choose a small working space that clipped the color to about the gamut of my display and then print it to my printer. If my printer's default profiles were actually OK for my printer (relatively rare but it does happen) then my print would look a lot like my screen. I could be satisfied with this but I might not know what I was missing. >Oh, I should add that if your "GameBoy" displays such colours that you are >pleased with, and you can reproduce them in a printing device what's wrong >with that? nothing, if that's your desire. This is a Pro list though isn't it? In my experience Pros are rarely satisfied with GameBoy-level color. My posts to this list are simply to help people understand the equipment they are using (a very positive side-effect of implementing color management). If you are satisfied with the equipment you are using then I don't see any argument here. If you have questions about the color science side of this stuff I'm happy to answer then as well. Otherwise I don't think I could sum it up any better than Mr. Kenward: > >Seeing is believing. Perhaps one day you would care to visit us and set up your >laptop alongside the screens here, and see just what a confining visual world you are >subjecting yourself to. Regards, Steve ________________________________________________________________________ o Steve Upton CHROMiX www.chromix.com o (hueman) 866.CHROMiX 206.985.6837 o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral -- =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
