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Home : Sketching with masks : Part 1: Painting the body blue :
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Next you'll create a mask for the entire car body.
1 Choose 
Windows > Editors > Plane/Layer editor to open the Plane/Layer editor window.
2 In the Plane/Layer editor window double-click Layer-# (where # is a number), type bodyBlue and press Enter to rename the layer.
3 Choose 
Paint > Shape > Make masked shape.
4 Click each of the six visible curves in sequential order.
Each curve should become highlighted in red and have a red arrow pointing at it.
5 Click Accept to create a mask using the highlighted curves.
Masked regions are shown in red. In this case, the inside of the car's body curves are masked. However, we want to be able to paint within the curves, and mask all regions outside the curves.
6 Choose 
Pick > Nothing to clear the selection.
7 Choose 
Canvas > Layer modify > Invert mask layer to invert the mask.
8 In the Plane/Layer editor window click the white triangle beside the bodyBlue layer to expand its list of mask layers.
In this case, there is only one mask layer for the bodyBlue layer: MaskShapeLayer-# (where # is a number).
bodyBlue is a canvas layer (indicated by Canvas layer) and MaskShapeLayer-# is a shape mask layer (indicated by shape mask).
A canvas layer contains paint (in this case, it does not contain any paint yet). A shape mask layer contains shapes and protects regions of a canvas layer.
9 In the Plane/Layer editor window, click the open eye icon for the mask layer to hide the red display color.
The icon becomes a closed eye to indicate that the mask display color is hidden.
Notice that masked regions are no longer indicated in red. These regions are still masked, however. Whether you choose to display masked regions in red or not is based on the specific situation and on your own personal preference.
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