Layer Boundary Size

The Layer Boundary Size lets you set the the boundary of the layer. Remember you can have a smaller or larger layer than the image boundary size. When you enlarge the boundary size, then you will add some space to paint on to your layer. Naturally it will be wise versa when you make the boundary size it smaller.

The size area will control how big or small your new layer boundary will be just as when you created a new layer. The Offset area will control how your layer is clipped or expanded.

Making the layer smaller:
The offset fields will control where your upper left corner of the old layer will be in the "new" layer. The best way to control the new location and how and where the layer will be clipped. Is to drag the "layer preview" in the Offset area to the right position, and make the final touch with the spin buttons (or type it in by hand). The thin outline is the new layer size and you have to drag the old layer to the right position so it will be clipped according to your demands.
Making the layer bigger:
The offset fields will control where your upper left corner of the old layer will be in the "new" layer. The best way to control the new location and how and where the layer will be clipped. Is to drag the "layer preview" in the Offset area to the right position, and make the final touch with the spin buttons (or type it in by hand). The outline/canvas  is the new layer size and you have to drag the old layer to the right position within it.

If you uncheck the chain in the Size area, you will be able to have different ratios when you make the "new" layer . It's therefore possible e.g to have a layer which is smaller in X direction and bigger in Y direction than before you altered the layer boundary size.

Additional Information

For further information see The Gimp User's Manual page XXXX and the Gimp User's Tutorial page YYYY

Shortcut Key

Modifier

Drag and Drop

Xinput

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