Modify the global opacity of a layer
In lesson 3, we learned in The advantage of working with several Layers chapter that it’s possible to have a Glass layer in front of a character by adding a transparency when creating the rectangle’s gradient.
However, you can modify the Global Opacity of a layer by clicking in the 100% square of the Timeline. The white bar will position itself on a new value. Click and hold to have the wished value.
With a few right clicks, you will change the opacity by one pixel (more or less)
Global Opacity of the Glass layer with various values:
Modification of the Glass layer's global opacity will vary the opacity of all pixels making up the layer.