Adobe After Effects - Manual (Page 400)

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Alpha
Alpha Boundary
Alpha Overlay
Layer panel view options
You can choose these view modes from the Show Channel menu in the Layer panel, by clicking the buttons in the Layer panel, or by using
keyboard shortcuts. You can use the controls at the bottom of the Layer panel to change the color and opacity of the overlays used in Alpha
Boundary and Alpha Overlay mode.
Shows alpha channel of layer (Alt+4 or Option+4).
Shows source layer with foreground and background unchanged, with segmentation boundary overlaid as colored outline (Alt+5
or Option+5).
note: Alpha Boundary view mode is turned off when the View menu in the Layer panel is changed to anything other than Roto Brush.
Shows source layer with foreground unchanged and background overlaid with a solid color (Alt+6 or Option+6).
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