Hi gang, I know that you can achieve 6500 many different ways and that doesn't make it right, the question that I want to know how many ways can you get to D65? and if you get to D65 what gamma is that? and is that the magic number 2.22? I understand that D65 and 6500 is the perfect solution but how does the gamma fit into it? Sorry I'm sure that the answer is probable too technical for here maybe just a simple answer would be best if thats possible. Thanks trying to find the holy grail! :D

Never mind..Look to Kras post.>Gotta love when someone starts off with no respect to correct by stating "that explanation is nonsense'...Some people may be mature at doing things and in other parts of their life, they lack it...

That explanation is nonsense - primaries do not track a color temperature.

Rather - color temperature is a specified curve in color space ranging from red to blue correlated to the temperature of the black body curve. 6500K is the line thru white ranging from magentish to greenish whites that intersects the blackbody curve. D65 is a specific point of white near that line and curve and achieved by balancing the mixture of the RGB primaries. There is no standard display gamma specified in the standards - only an encoding gamma is specified. Gamma is a function of display technology and the environment and your personal preference.

Please take a look at the attached plot; it illustrates what kras stated. The black body temperature curve is shown with various temperature points along it. The 6500K isotherm intersects the black body curve somewhat perpendicularly as I've illustrated. Notice that although the color temperature stays constant at 6500K, the coloration can run from magenta to green. D65 is a specific point that is near both the black body curve and 6500K isotherm, but insn't actually on either one of them.

-Steve

and btw, though gamma is not relevant to the color temperature for your white point, the 'magic gamma' is 2.5.

let me put it another way if i can. if you can calibrate/adjust your set as close to D65 at every point on your gray scale regardless of the gamma, and your temp should track at 6500 and you cannot get any closer to the HOLY GRAIL aka the perfect calibration correct? :eek:

Gamma and color temperature are two separate things. Gamma is related to the display's light output as a function of signal input level. Ideally, gamma is not affected by the gray scale adjustments, and vice-versa. If your display has a gamma setting with mutiple values, select a value between 2.2 and 2.5 (to suit your taste), and then perform the gray scale calibration. If your display does not have a user adjustable gamma setting, then you are stuck with whatever gamma the manufacturer has set. In either case, that's as close to perfect as you will get.

-Steve