Locking transparency

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Lock Transparency creates a mask that locks the transparent portion of the layer from being edited. This means that when you draw on that layer, you can only affect areas containing pixels.

In the example below, I only wanted to paint on the hippo. With Lock Transparency on, I can paint in broad strokes without worrying about coloring outside the shape.

Locking transparency in Sketchbook Pro for desktop

1. In the Layer Editor, tap a layer to select it.
2. To lock its transparency, tap . You will see the icon change to indicate transparency is now locked .
3. Tap the icon again to unlock transparency.

Locking transparency in Sketchbook for mobile devices

In the Layer Editor, tap a layer to select it. The transparency icon will appear in the lower left corner .

1. Tap the icon to lock transparency . The icon will remain visible while the layer's transparency is locked, even when the layer is not active.
2. Tap the  icon again to unlock transparency.

You can also access layer transparency lock in the Layer Menu