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It's now time to take a look at this output mask here, something we talked about earlier, but we said we were going to look at it later. Well, it's later. Here's the issue. When you're painting, the RotoPaint node will make a nice mask for you. Put him in the alpha channel so that you can use it later if you want to do like a regrain. But what about our blur or sharpen? So, let's take a look at that situation. I want to select the Brush tool and increase by brush size and paint up here.
Now, the output of the RotoPaint node right here is set for rgba. So, this paint shows up in the alpha channel. There is the alpha channel of the viewer, okay? That's well and good. Of course, Marcie is a three-channel image. However, I'm going to go over here and turn on the Eyedropper, then Command+Click on the screen to select this red, and paint that. Now let's look at the alpha channel. Oops! There is no alpha for this. Why is that? The reason is when I used the color picker to pull up this red, I pulled up by three-channel red.
There is no alpha channel on this image, so the brush painted a three-channel red, no alpha channel. So now, I don't have a mask if I need it to regrain this. Similarly, let's look at the Blur tool. Let me turn the effect up to 15, and if I run a great big blur across here, again, nothing in the alpha channel. Select RGB, and one more, the Smear tool, and we'll smear this. And still nothing in the alpha channel. But the RotoPaint node is creating a mask for every single stroke you do.
It's called the output mask right here and you can place this one channel mask anywhere you wish. For example, if I go over to none, to the pop-up and say put the output mask into the rgba.alpha channel of this image, right? Now, when I switch the alpha channel, there they are. Every single brush stroke I did now has a mask. I can use it to regrain or anything I want. I can also turn it off. However, I could also say I want you to put that output mask into the mask.a channel.
The mask.a channel is kind of a special reserved channel in Nuke that you can use to temporarily throw any masks in you want. So, I'm going to put the output mask into the mask.a channel. It has disappeared out of the alpha channel. Where is it? If I go over here and say put mask.a channel into the viewer alpha channel, there they are. So, the output masked option will give you a mask for every single brush stroke you do in the RotoPaint node. Next, let's take a look at the Dodge tool.
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