Working with Input and Output Nodes - Blender Compositing and Post Processing - page 22

The RGB node
The RGB node loads a fixed color. The color can be chosen from the color wheel
and a vertical value bar seen on the node. Alternatively, a bigger color wheel can be
obtained by clicking on the colored rectangle at the bottom of the node. This value
can be inserted to animate the image by right-clicking on it and clicking on Insert
Keyframe .
The Value node
Similar to the RGB node, the Value node loads a constant value to the flow. The
Value slider provided at the bottom of the node can be used to attain the required
value. A value can be manually entered by left-clicking the slider or by left-clicking
on it, holding, and dragging the values. This value can be keyed to animate by right-
clicking on it and clicking on Insert Keyframe .
The Texture node
The Texture node can load any texture that's available in the current Blender file or
from Blender's procedural texture library, as shown in following screenshot:
The Color socket outputs the RGB channel of the texture and the Value socket out-
puts the Luminance channel of the texture. The Offset and Scale parameters can
be used to modify the texture. This modification will not affect the texture itself.