Image Processing Reference
In-Depth Information
• To complete the following steps and to delete the sky, so that the cleared
area will be transparent, you must assign an alpha channel to the layer.
Select
Add Alpha Channel
in the context menu by right-clicking the
Landscape
layer in the
Layers
dialog.
• Select the
Edit > Clear
menu item to delete the sky on the
Landscape
layer.
• Select the
Select > Save to Channel
menu item to save your selection as an
alpha channel before deleting it in the image by choosing
Select > None
.
Figure 3.26
Extended selection with feathered border
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