调色=改映射Grading = Changing Mappings
学习目标LEARNING OBJECTIVES
学完你能说清调色时实际在改什么——数值映射与解释规则。
概念说明CONCEPTS
每个像素是一组数值。调色=给数值套一个映射：(R,G,B)→(R′,G′,B′)。轮子、曲线、色条都是函数；LUT=预算好的三维查找表（只查表，不判断）。
节点图为什么讲究顺序：一串函数组合，顺序不同、结果不同——同一 LUT 放前放后完全两样。色彩管理决定：数值在哪个空间被解释。
操作步骤STEPS
- 同一 LUT 放在节点链最前与最后各看一次
- 对比差别
- 体会：顺序即数学
练习PRACTICE
动手任务
建一条节点链，把同一 LUT 分别放在一级校色前与后，截图对比。
自检清单
做完任务后逐条自查，全部能打勾才算过。
常见问题FAQ
LUT 是滤镜吗？
是预算好的查找表——只查表、不判断；放的位置不同，结果完全两样。
为什么调色里节点的顺序这么讲究？
一串函数组合，顺序不同、结果不同；色彩管理还决定数值在哪个空间被解释。
Learning Objectives学习目标
After this card you can say what grading actually changes — the value mapping and the interpretation rules.
Concepts概念说明
Every pixel is a set of values. Grading applies a mapping: (R,G,B) → (R′,G′,B′). Wheels, curves and bars are all functions; a LUT is a pre-computed 3D lookup table — it only looks up, it doesn't judge.
Why node order matters: a chain of composed functions gives different results in a different order — the same LUT placed early or late is two completely different pictures. Colour management decides which space the values are interpreted in.
Steps操作步骤
- Place the same LUT first and last in the node chain and compare
- Note the difference
- Notice: order is mathematics
Practice练习
Hands-on task
Build one node chain and place the same LUT before and after your primary correction; screenshot both.
Self-check
Work through the task, then tick every line; all checked means you own this card.
FAQ常见问题
Is a LUT a filter?
It's a pre-computed lookup table — lookup only, no judgement; placed early or late, two different results.
Why does node order matter so much in grading?
A chain of composed functions: different order, different result — and colour management decides in which space the numbers are interpreted.
本卡术语Terms in this card
色彩管理Color Management 曲线Curves 调色Grade LUT（查找表）LUT 节点Node 映射（调色）Mapping 像素Pixel