OKay how come in photography when you adjust white balance lower numbers turns more blue and higher numbers turn yellow. now for imstance my fish tank the lights are opposite. lower temp is yellow and higher temp is more blue.
thanks
chris
Chris,
It's not different from the old analog days, when we had to place a filter in front of the lens, say, if we were using tungsten film to shoot in daylight.
If you were shooting a daylight scene without a filter while tungsten film was loaded in your camera, the resulting image would look too blue, because the tungsten film was color-balanced for a much yellower light. If you added a yellow-orange filter in front of the lens (a Wratten #85 or 85B, if memory serves) and also increased the exposure to compensate for the decreased amount of light hitting the film, then the scene's overall color would be aligned to the film's own color balance, and the tungsten film would no longer produce a blue cast: the image would look realistic, rather than color-casted.
Similarly, to go back to ACR, think of the image portrayed in your image as if it were the
scene in front of that old analog camera, and think of the slider in ACR as if it were the
film inside that old analog camera. If the scene is in daylight (let's say, 5000 Kelvin, for the sake of argument) but your slider is at 3000 Kelvin or so (roughly the correlated color temperature of tungsten light, or the color balance of tungsten film), the image in ACR will look too blue.
Quod erat demonstrandum.I hope that helped.