引用:

原帖由 冰镇石油 于 2013-5-5 20:54 发表


助拳的各位真心要帮文片就帮文片找到这个定义的出处，喷我没有用，
实际上这个简单的问题喷这么多我自己都觉得自己无聊，较真了点而已。

你说的定义对，但是结论错了

In principle, one wants to scale all relative luminances in an image so that objects which are believed to be neutral appear so. If, say, a surface with  was believed to be a white object has R=240, and if 255 is the count which corresponds to white, one could multiply all red values by 255/240. Doing analogously for green and blue would result, at least in theory, in a color balanced image. In this type of transformation the 3x3 matrix is a diagonal matrix.

简单来说，（白平衡校正后的r g b） = A[255,(相机认为是neutral grey的r，g，b)]*[校正前的r,g,b]

从wiki上的描述来看，依然有环境光的影响。所以你们说的白平衡是去掉环境光影响是错的。

引用:

原帖由 冰镇石油 于 2013-5-5 21:29 发表

你说的是算法的缺陷，只能说该算法暂时不能达到完全过滤光源的效果，
但是不能代表白平衡的定义是错的，实际上即使你采用手动白平衡，无论你用打印纸白墙或者18%的灰卡都无法百分之一百的还原出那个理想白色。

用灰卡调的话怎么可能避过环境光的影响？

http://www.cambridgeincolour.com/tutorials/white-balance.htm

White balance (WB) is the process of removing unrealistic color casts, so that objects which appear white in person are rendered white in your photo. Proper camera white balance has to take into account the "color temperature" of a light source, which refers to the relative warmth or coolness of white light. Our eyes are very good at judging what is white under different light sources, but digital cameras often have great difficulty with auto white balance (AWB) — and can create unsightly blue, orange, or even green color casts.

这里说要remove unrealistic color casts，unrealistic怎么定义呢，按照人眼所见和你说的完全去掉环境光影响，我觉得“符合人眼所见的reality 光照“ 要更符合定义，也更实用。

引用:

原帖由 冰镇石油 于 2013-5-5 21:44 发表

既然讨论AWB，你在民用领域实际上AWB算法好坏差别不大，人眼自适应能力很强，比如顶楼的例子，随便拿出哪一个单独看你都不会觉得哇好假哦的感觉，
但是在商业摄影领域，你觉得还有摄影师会用AWB么，以肉眼感官为标 ...

商业领域自定义wb后去掉了所有环境光的影响？？？

那么那些巨贵的灯光设备就是照明用么？？