The Color Nodes

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This is such a large topic that it deserves an entire Wiki devoted to it. However...

Color and Nuke

Why Nuke is and isn't a great color manipulator.

Color in Nuke: an Intro

Color nodes

Really important nodes are marked with an asterix:

Math sub menu

Add
Multiply *

Clamp

ColorLookup *

ColorSpace

ColorCorrect *

Exposure (and why not to use it)

Grade *

Histogram (and why it isn't so great)

HueCorrect *

HueShift

HSVTool

Saturation *

Sampler *

Color operations

All color edits involve one or more discreet operations that are, at heart, entirely mathematical. They may be visualized using the Sampler node, using the method described here.

This is a table of which color operations are to be found in which Node:

The color picker

All color nodes feature a color picker, using which a color may be selected. It is described here.

Color grading

A short review of color grading here.

Evaluating color

When doing a color manipulation on an image it is wise to seek feedback on what you are doing. Nuke has many tools with which this can be done. Here's how.