GIMP tools - BDA

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1. Replace the current selection causes any existing selection to be destroyed
and a new selection created.
2. Add to the current selection Shift causes the new selection to be added to
any existing active selection:
3. Subtract from the current selection Ctrl removes the new selection from
any existing active selection area:
4. Intersect with the current selection Shift+Ctrl makes a new selection from
the area where the existing selection area and the new selection area overlap:
The following modifier keys are very often used when creating a selection:
CTRL
Key
Usage
When creating a selection, holding down the Ctrl key toggles the “Expand
from center” option, i.e. the point where the selection is started by
pressing the mouse button is used as a centre of the selected area.
If you hold down the CTRL key before drawing a selection, this new
selection will be subtracted from an existing one.
ALT
Holding ALT allows movement of the frame of the current selection.