白点White Point

白点是一个色彩标准里「什么算白」的约定——白定了，其他颜色才有坐标原点。

• 常见几档：D50、D55（约 5500K）、D65（约 6500K，显示器与 709 的标准白）、DCI。
• 白点不匹配的后果：整片统一偏暖或偏冷——不是某个颜色错，是「白」这个原点错位了。
• 调白点不是加滤镜：它是把坐标原点挪回正确位置，中性色回到中性。
• 和白平衡不同：白平衡是拍摄时对现场光源的补偿；白点是色彩标准自身的定义。

A white point is the agreement inside a color standard about what counts as white — once white is fixed, every other color has an origin.

• Common stops: D50, D55 (about 5500K), D65 (about 6500K — the standard white of monitors and 709), DCI.
• When white points mismatch: the whole piece drifts warm or cold — not one wrong color, but the origin itself out of place.
• Setting a white point is not a filter: it moves the origin back so neutrals return to neutral.
• Not white balance: white balance compensates for the light on set when shooting; the white point is the color standard's own definition.