Image Processing Reference
frame around the
selection in the image
and the extended tool
settings of the Ellipse
Select tool (Image
courtesy of NASA)
• Reduce the feathering in your selection to about 5 px ( Select > Feather ).
• Access the Edit > Copy function and copy the object within the selection—
the moon—to the clipboard. Then close the moon.png image.
• Switch to the fenice_base.xcf image.
• Set the top layer to active in the Layers dialog.
• Choose Edit > Paste . Since the top layer is active, the content from the
clipboard - still the moon - is inserted on top of this layer.
• Accept the pasted layer as a new layer by right-clicking and selecting New
Layer . Call this layer moon .
• Position the layer and use the Scale tool to enlarge it until you're happy.
• Now transform the moon into a sickle. To do this, irst drag an elliptic
selection with strong feathering (about 200 px) partially over the moon.
Choose Edit > Clear to delete the contents of the selection. Select Select >
None to delete the elliptical selection. Reduce the opacity of the moon to
about 75% in the Layers dialog.
• In the Layers dialog, select Addition or Screen in the Mode drop-down
• Save your image.
As you can see, most of the work steps are slowly becoming routine as
you repeat them. So far, however, we haven't used any Mode options. The
Normal mode produces overlays that act as you would intuitively expect them