You can move, scale, or rotate an image layer relative to its canvas plane or relative to other image layers (if the canvas plane contains more than one image layer).
To move, scale, or rotate an image layer
To transform more than one layer at once, link the other layers to the selected one by turning on their icon
A manipulator appears on the active image layer.
When you move the mouse over the manipulator, a context-sensitive cursor shows the current transform mode (move, scale, rotate).
To enter exact numerical values, use the text fields in the option box.
Choose Edit > Undo to undo the image layer transformations.
See also Scale a canvas plane.