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Here is a specific application of painting with Film Grain or indeed any kind of filter and that's really the message that I'd like you to get from this movie, we can paint in the textures that we apply with our filters. So what I have here is this picture of a bookstore window. I've just made the windows look dirty by applying a layer of digital soot in effect and this is done through the application of a Film Grain Filter and also some blurring of that filter so it looks a little bit less granular and then to define exactly where that soot goes in the corner of the windows, I've created a layer Mask and painted on that layer Mask.
So let's create this from scratch. So here is my starting point and the first thing I'm going to do is add a layer to accommodate my grain. Now I forgot when I created that layer to hold down my Alt or Option key when I clicked on this button here, so if you do forget that, then all you need to do is this, we're now going to fill that layer with neutral gray. I'm going to press Shift+Backspace, Shift+Delete key to go to my Fill Command where I'm going to use 50% Gray, and then I'm going to set the Blending mode of the layer to Overlay.
I'm going to convert this layer for Smart Filters, just so I can leave a trace and then come back and I'm going to go Artistic and Film Grain where I'm going to add a lot of grain, not quite the maximum. The intensity in this case because it's being applied to a layer of flat gray has no effect whatsoever and neither does the highlight area. So all we're worried about here is the amount of grain. Let's go up to about 16.
So now I'm going to paint out where I don't want this digital soot to appear. If I go to my Channels panel, I have an Alpha channel already prepared. That Alpha channel is just the woodwork on the windows. So I'm going to load that by Command+ clicking on the Alpha channel and that would load it as a selection. Then coming to the Filter Mask, I'm going to fill that selection with black, so I make black my foreground color and press Option+Delete or Alt+Delete.
So that's now removed the grain from the woodwork on the windows and what I need to do now is just paint out where else I don't want the grain to occur. So I'm going to choose my Brush tool and I want to make sure that I have a soft edge brush, and then I can just go in and sort of paint out, like so. So, now that I have painted out where I don't want the grain to occur and I might want to just refine this a little bit on the mask itself, one more thing I can do is we can come and just add a bit of blurring to that.
I'm going to use the Gaussian Blur Filter and making sure that I'm not on the mask itself, but actually on the layer, Blur>Gaussian Blur and I don't want to add to much, that's going to obliterate it completely. Something between about 0.5 and 1, I think, would be about the right amount and we go up to 0.8. That effect is probably a bit too subtle to be captured on the video, but that's just made it a little bit less artificial looking.
So there is the grain before the filter, the blurring and there is after and there is the finished effect and while you may not need to make windows look dirty, I'm sure that you can type the principles of what we have here, the ability to be out of paint on a filter mask so that we can paint in or out the particular texture that we're applying to our image.
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