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Given this slightly supernatural nature of this composition, I think that the colors are a little undersaturated. So what I would like to do is boost the saturation of the composition as a whole. Now, as you may recall, you can boost the saturation of a single image by going up to the Image menu, choosing Adjustments and choosing the Hue/Saturation command, but that affects just one layer at a time. What if you want to increase the saturation of an entire composition, entire layered composition? Well, in that case, you need to add an Adjustment layer.
So go down to the bottom of the Layers pallet, click on this little black white icon right there and then go ahead and choose Hue/Saturation from this popup menu and click on the Saturation option right there. Let's go ahead and press Shift+Up arrow three times in a row to take the saturation value up to 30% and that of course delivers some much more of vivid colors. Click OK in order to accept that modification, and you can see that this now an independent layer of color adjustment that affects all layers below it.
Now, what we have here to identify this layer is a little thumbnail that looks sort of like a gradient film that indicates that this is a Hue/Saturation layer as it turns out. So that little gray area is supposed to represent the full color spectrum just in grayscale, don't you know? And then to the right of it, we have a black layer mask. Well, in our case, we don't need the layer mask. Reduce the layer mask if we wanted it, to limit the area that's affected by the Adjustment layer by painting some of the layer mask black, for example. But, in our case, we don't need that.
Let's go ahead and get rid of that layer mask. And the easiest way to get rid of a layer mask just to delete it, so that you have more room in order to see the layer name for example is to press the Alt key or the Option key on the Mac and click on the Trash Can icon, and that will go ahead and delete that layer mask because the layer mask was the portion of the layer that was selected, it had the heavy rectangle around it. Now, I will go ahead and double-click on this layer name here and call it Boost Sat, just so that I know it's a saturation booster. Now, above this saturation booster right here, we have this folder that's called Adjustments, and this folder indicates a layer group as it turns out, meaning a group of other layers that are just sort of grouped together so that they take less room inside the Layers palette.
If you want to see that group of layers, go ahead and twirl it open by clicking on this little twirly triangle right there. Then, I invite you to click in front of the Adjustments item to turn on its eyeball. Now, sometimes, that will go ahead and turn on all the layers inside of the group as well. But in this case, it didn't because the individual layers were hidden. So I need to turn them on one by one by clicking in front of them, and notice that each one of these items is an independent Adjustment layer.
This guy, this little thumbnail, indicates the Levels Adjustment layer. This one indicates a Gradient Map Adjustment layer. We haven't seen that yet, we will see that later actually. And this one indicates another Hue/Saturation Adjustment layer. So I will turn on dimmer which dims down the image according to the levels adjustment. And if you want to see the specific settings assigned to that Adjustment layer, all you have to do is double-click on the thumbnail, and that will bring up the dialog box and you can see that I didn't do anything to the input levels but I took the white value in the output levels and I dimmed it down in order to create a dimmer effect right here, interesting.
Alright, so I will cancel out of this dialog box. I don't need to change it, but if I want to, I could, I could make changes inside that dialog box and update the image dynamically. Really cool thing about Adjustment layers, and we will by the way spend an entire chapter with Adjustment layers later on in the series. Alright, now, I am going to turn on the Duotone layer which goes ahead and assigns a sort of red color throughout the image. So it gets rid of the previous colors that we were seeing and replaces them with this red. And then, I have got another layer that goes ahead and colorizes the whole thing green.
Now, let's say I want to take this Boost Sat layer here and make it part of the Adjustments group, how would I do that? Well, I just go ahead and drag it and drop it onto the group. So if I drop it on to the folder icon like this, then the Boost Sat layer will appear at the bottom of the group like so. What if I want to put it elsewhere in the group? Well, I'll go ahead and undo that modification. You just have to drag it and drop it where you want it to be, like I could drop it there or I could drop it there. If I want it to be at the top of the stack, I would go ahead and drag it at the top of the stack like that.
So your options are boundless. Let's go ahead and put it at the top of the stack incidentally and then you can go ahead and twirl your folder close in order to keep all of your adjustments tidy inside of this little group.
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