Lesson Info

Understanding Curves

So now let's move on and look at other adjustments that are much more powerful than levels. Levels is very useful, but I think there's something that could be dramatically more useful. And that is, as I work my way down this adjustment menu, I get beyond levels and I find curves. Curves is the ultimate tonal adjustments. You can do things that no other adjustment conduce. And in fact, the other adjustments we use thus far are actually using curves behind the scenes to do the work that they dio. And they're just trying to present you with a simpler screen, a simpler interface to interact with. But if you want full control, you want to use curves. Now. Curves is something that is not easy to learn on your own, but I'll get you toe, understand how it works, and it will take you practice before you are good with it. But the practice, I think, is worth it because you'll get ultimate control over your images. So in curves, let's see how this works Well, if you look at curves, it's a diagonal...

line going across a grid, and at the bottom is a Grady int that has all the brightness levels you could have in your picture. And in fact, most of the time this Grady it will be reversed where black will be on the left. It's only because I have a, um, a grayscale picture that it's reversed. If I take this image and converted Targhee be the vast majority of images we're gonna work on will be RGB in. Therefore, if I go into curves after that, now you see black is on the left. Whereas a moment ago it was reversed. Why is that? Well, when you're working with gray scale, it's thinking about Inc And when you're working in RGB is thinking about light. The two are opposite of each other. Ah, 100% light is the same as 0% Inc and therefore it flips it. It'll make sense in a few moments. So we have that Grady. And at the bottom, then the diagonal line is just telling you how much light would be used to create the shades you see down here. So to create black, this is all the way at the bottom because you would use no light whatsoever to create something this bright. If you go straight up. You'd use this much light compared to the amount you could use, which is all the way to the top. And as you work your way this way, you see the curve above that diagonal line that IHS gets higher and hired. Indicate you'd use mawr and mawr, inm or light. And once you get to white, the curve is all the way at the top because you've maxed it out. You can't get any brighter than white, so you can't go any higher than that, so this would be as high as you could possibly go. The way I think of it is, since it's talking about light, I think about a dimmer switch if you go to your kitchen and you find that one of your, uh lights is on a dimmer, and it's not the kind that's a knob. Instead, it's the kind you push up and down. It's just like curves. If you move that dimmer all the way to the bottom, it turns the lights off in the room is solid black. You can't see a thing and listers windows. Then, as you move the slider up, you add more light into gets brighter. And once you max out, that slider is high as it can go, it's not possible to make the room any brighter without adding some other light source in. In the case of Photoshopped, the brightest we can get is white, so we'll get it all. The way to the top is white, so just think of it as picking one of these shades and then going straight up until you hit the diagonal line, and that tells you how far up the dimmer switch would be. You're not as high as he could possibly go because it's not white. You're not having lights turned off your somewhere in between. All right, then what can I do with this? Well, you can move your mouse on your image. And if you click this little hand icon that's in the lower left, then that means that if I move my mouse over my image, it should think about curbs. And so when I go over my image, you'll see a circle and curbs in. The only thing that circle is doing is it's telling me how much light is in the various areas. I put my mouse on top of. So if you're to go straight down from wherever that circle is appearing and you look at that bar that spans the bottom, it would be sitting directly above the exact shade my mouse is on. So it's just telling me how much light is in each area. Well, this doesn't sound too exciting yet. What if I want to make two of these bars exactly the same brightness level, but I want to leave all the other bars alone. I can do that if I want to take this bar and I want to take this bar, get them to be the exact same brightness level. I could do it very quickly and easily and curves, and then I can take the other bars and get them back, but where they used to be, This is close to that if you know what you're doing, and I haven't described enough yet for you to know what you're doing. But let me turn preview off years before here's after. Do you see those two bars that became identical? It looks like the brightest part of the image is getting a little too Ah, dark. So I have toe adjust that, too. But let's then say instead, I want to do the opposite. I want just those two bars to look more dramatically different from each other than they used to. Well, let's start over here and I want to make this bar brighter. Gotta turn on this little hand, make this bar brighter, make this bar darker. There is a greater difference between the two. I can easily do that. Then I want the other bars to go a little bit back to where they were. Not exactly, but closer. I have control over that kind of stuff, and I have none of that control. When I'm in levels or brightness and contrast, I can't click on my picture and say, Think about this brightness level and do something specific on Lee that brightness level

Class Description

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