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Peter- the white balance tool is for either white/black or grey. If you have something in your picture that you know is either of the three colours than click on this one. Now there is a slight problem with this:let's assume you white point is all the way to the right of your image and you click on it than the wb for your centre part might be slightly off as the light intensity and temperature varies over your image. In other words: if you include a grey card in your first shot than this grey cards needs to be placed let's say in front of your subject's face as later on you want the right wb patricularly for that part of the image. If you'd come from the olden days where we used lightmeters than you might remember that you always hold your lightmeter facing the camera from i.e. the face of you subject. Once you move this lightmeter slightly to the side of your subject you will get a different reading (usually). The same principle is with grey cards: they need to be place exactly where you want your wb to be corrected.Now coming back to your question: if you can find a white spot/ black one or grey one in the middle of your image- than this would be better. Alternatively...if you have neither of the three colours in your image than the wb toll can be used on something that you would consider the nearest to a grey point. I.e. a stump of a tree...Finally it has to be said: a custom wb is the best you can do- followed by: including a grey card in your first image that you then use for setting your wb in your raw converter. Here again: you have to repeat doing your custom wb or include a grey card EACH time the light changes...Hope this helps? More questions? Just shoot...Stef.