I struggle to achieve close enough true colors straight from camera(I take photos of fabric) – you will probably know why when you read the rest. There are lots of theories on WB and metering and use of histograms but to be honest I somehow miss the point of it all. If our camera meters for 18% grey all the time (spot or partial metering I do not use other types ) and use the zone system or a grey card as our guide is this the reference point for the histogram if not what exactly is reference point for a histogram. If the histogram is only a result of our exposure settings and has no reference to the mattering system directly then we are left to search for correct WB and 18% grey ourselves. And how does this then translate to the fact that the colors change depending on the intensity of light reflected from them – when we use flash for example. If we could get 18% grey in the middle of our histogram at least we would have ref point and new where we are in our dynamic range. I sort of understand that lighting conditions are crucial but even when light is good taking a photo of a grey card it takes a lot of messing about to get it in the middle of the histogram (then everything looks wrong anyway) or even better taking a photo of a white and a black card together will almost never end up at the opposite sides of the histogram but mostly fairly near each other(unless we flash it to death) – so what is histogram all really about and it is worth researching any further.