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Lock Transparency creates a mask that locks out the transparent portion of the layer. This means that when you draw on that layer, you only affect areas containing pixels.
In the example below, I only wanted to paint on the car. With Lock Transparency on, I could paint the car without having to worry about painting white areas, like the windows, as well.
Locking transparency in Sketchbook Pro for desktop
- In the Layer Editor, tap a layer to select it.
- To lock its transparency, tap . You will see it change to indicate transparency is now locked .
Tap the icon again to unlock transparency.
Locking transparency in Sketchbook for mobile devices
- In the Layer Editor, tap a layer to select it
- Tap the layer again to make the lock icon appear
- Tap the lock icon to lock transparency. The icon will remain visible while they layer transparency is locked.
At this point, if you paint on the current layer, only the areas with pixels will be changed. In the image above, the layer with the robot's head was selected. Painting on this layer only applied color to that area.