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Okay, making a Knockout. I warn you, this one may make your head hurt, so you may consider during a cup of coffee before you approach this one. Let me just break down these layers for you. We have four layers. There's the background layer, on top of which we have a field of color, on top of which we have a black circle, and at the very top we have a white circle. Let's look at different ways of having the white circle punch a hole through the layers and get some slightly different results. So this is called a Knockout and if I double-click to the right of the layer name, here is the drop-down. So currently there is no knockout applied.
I'm going to change this to Shallow. It has no effect whatsoever. That's because the knockout needs to be combined with the Fill Opacity. When I turned down the Fill Opacity, it knocks through to the background layer. That's Shallow. Deep is exactly the same. That's because at the moment the white circle and black circle are not grouped together. So when they're not grouped, Shallow and Deep are going to give us the same effect. I'm just going to click OK to come out of here, and something else that we need to consider is this relies upon the use of a background layer.
Or rather you're going to get different results if you have a background layer to what you would get if you have an unlocked layer. If I unlock the background layer just by double-clicking on it, we see that the knockout now goes all the way through to transparency and that's the same if it were Shallow or Deep. So I am now going to undo that, Command+ Option+Z, Ctrl+Alt+Z. We're now back to having a background layer.
I'm going to group my white circle and black circle together, so I'm holding down the Shift key to select those two layers, and I'm going to press Command+G or Ctrl+G to put them in a group. Now I'll expand that group, double- click to the right of the name of the white circle and now if I make this Shallow, we see that it only punches through to the bottom of the group and only gets as far as the field of color. Change that to Deep and it's going all the way through to the background layer.
But just to make that point once again, if the background layer is unlocked, then it's going to go all the way through to transparency. If it's Deep. But still it would only go through to the bottom of the layer group if it's Shallow.
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