Why are some processes grayed out in the Image Analysis window?

The Processing pane on the Image Analysis window contains various tools that can instantaneously process your data on-the-fly.  However not all of the button are active all of the time.  This is because each tool is dependent on the layers that are selected in the layer list.

Processing Pane

Below is a list of each tool, and when it is enabled:
Active conditions for IAW processing

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