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In this chapter we are going to take a look at saturating and desaturating colors, how to do so, and when you might want to do so. So here I have a picture of a road that I took near Death Valley in California. If you've ever been on a road like this, it's irresistible taking a picture of the road. And I know it's a bit of a clich?, but I've got loads of pictures like this. Now, what I want to do is I want to really amp up the yellowness of the stripe. So I want to selectively saturate just that stripe in the road.
And I am going to do this using my Hue/Saturation adjustment layer. So I am going to choose that, and then I am going to choose my Targeted Adjustment tool. And then move over the yellow stripe and click and drag to the right, and you'll see that as I am doing that the Saturation Slider is moving to the right and we are saturating the Yellows in the image. Well, that's fine. It's giving us a more yellow stripe, but we have got more yellow everywhere.
So our next step is to mask out this change completely. The Hue/Saturation adjustment layer comes with a layer mask, and I'm going to fill that layer mask with Black; Black is my Foreground Color. So I am going to press Option or Alt and the Backspace/Delete key and we're back to square one, except that we now have the adjustment already set up, it's got a layer mask with it, and we can now paint in the stripe. I am going to choose my Brush tool, make sure I have a soft edge brush, and then I am just going to paint over that stripe.
I am pressing the Right Bracket to increase my brush size, and I need to be painting over it in White. Painting over in White is going to reveal the Saturation adjustment that I made. And as I get further down that road, I will just make my brush a little bit smaller.
Now, if subtlety is not my thing, and let's pretend that for today subtlety is not my thing, then what I also want to do is desaturate everything else so that we really make that yellow stripe prominent. So I am now going to add another Hue/ Saturation adjustment layer, and on this one I am just going to get the Saturation Slider and have it affect all colors, so I am on the master for all of the colors and I am going to move that to the left and desaturate the whole image.
But now to bring back the yellow stripe, I'm going to borrow the mask that I made on the previous layer and I am going to copy it to my second adjustment layer. I am going to hold down my Option or Alt key and then drag that onto the existing layer mask. It's going to be ask me if I want to replace, and I do. All I need to do now is invert that mask so that it's painted Black over the yellow stripes, so that it protects the yellow stripe from the desaturation that's happening here.
And to invert the mask I just press Command+I or Ctrl+I. So there is our end result. And you can of course dial in the exact amount of that using the Opacity Slider on either of these two adjustment layers if you feel like that's a little bit too much. Or you can also come back to the first adjustment layer and go to the Yellows and maybe take down the Saturation a bit, but I quite like it like that.
So there we saturated the yellow stripe and the yellow stripe only, and just to really accentuate the difference between it and the rest of the image we desaturated everything else.
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