Using Masks and Layers—Painting, Filling, and Color Tools - GIMP 2.6 for Photographers: Image Editing with Open Source Software - page 291

Figure 3.107
The selection was
switched to masking
mode using Toggle
Quick Mask.

• Now copy the lion with the selection onto your clipboard ( Edit > Copy ).
• Open the fenice_base.xcf image.
• Add your lion from the clipboard by pasting it into a new layer ( Edit >
Paste ). Then select New Layer in the Layers dialog and name the new layer
lion .
• Next, mirror the lion horizontally with the Flip tool from the Toolbox.
This way, the lighting is correct, that is, if you placed the moon as in the
example. Select the tool, and then activate the lion layer in the Layers
dialog. Click on the image with the tool to mirror the image. An alternative
method would be to choose Flip Horizontally from the Image > Transform
or Layer > Transform menu.
• Position the lion in the image. You can also scale the lion if you prefer.
• You can adjust the brightness of the lion to the surrounding environment
by choosing Colors > Brightness-Contrast . You may have to repeat this
process.

• NOTE
On masks, black serves to add to
the mask surface. Applying white
color on masks would cause an
effect corresponding to erasing on
the mask. You can also use the
Eraser tool to delete a section of
the mask.

The lion is now inserted in the image. Next you'll create a drop shadow of
the lion on the background. Proceed as follows:
• Choose Layer to Image Size from the Layer menu. The layer is resized to
the size of the image. This step is so that other image sections aren't filled
as you're filling the lion selection.