Originally posted by axl no you don't you adjust white balance in your camera so you don't have to adjust the color in PPing...
When shooting in RAW, color balance is only a "serving suggestion." Balance presets can often get you close. Manual balancing for incident light in a particular situation can be very accurate IF incident light is uniform and reflected light does not produce color cast. In the field, this is often not the case. Part of a scene may be lit by direct sun, part by blue sky. Reflection from green vegetation or orange rock can effect color. The camera cannot know what I want. At dawn I may want the ultra-cool color of skylight that can reach 20,000*K, or I may want to correct to 5000*K balance. Under artificial light, I can use the approximation to natural light, or I may want to boost an important color that is misrepresented by the imperfect CRI of the source.