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In order to deepen and broaden our understanding of Layers, in this movie we are going to talk about History. History is built in the Photoshop. There is also a History brush that we can use in order to modify what we have created in our Photoshop document. All right, well let's open up the file history.psd. Press F to go to Full Screen View mode, Spacebar to reposition the image. Here you will notice I have a Background layer, a Text layer and then I have a Drawing layer. Let's click in the Drawing layer to target that layer. Next navigate to your Window pulldown menu and choose History.
All right, well here you can see my history panel, I'm then going to grab my Brush tool and I'm going to paint a brush stroke at 2005. Interesting, History noted that I did that and I'll go ahead and add some more brush strokes and let's say I'm going through time so to speak. Now we are going to talk about History analogously just a little bit here. One of the things you will notice is I have these different brush strokes here and all of them are included in my Layers palette. Now how many History States will be recorded in this History panel? Well, that depends on your Preferences, right? If you navigate to your Photoshop pulldown menu Preferences and General, that's for a Mac. For a PC, Edit > Preferences > General and then select Performance. Here is where you can choose how many History States, you want Photoshop to remember. Okay, well so far I have these states remembered how then do I Undo those? Well, let me show you a couple of different techniques. One is Ctrl+Z on a PC; Command+Z on a Mac goes back one step and then goes forward one step. So it allows you to go back and then go forward to Undo and then to Redo. But let's say you want to Undo multiple steps. on a Mac/Command+Option+Z, on a PC, Ctrl+Alt+Z and then press Z multiple times and here you can see I'm stepping back to the History.
Now let's say you don't like shortcuts. Well fine, all you need to do is in your History panel, click on the different states and you can go forwards and backwards to those different edits that you have made. Well, let's now take a look at another tool that we have here. It's called the History brush. I'm going to bring this History panel over here for a second. I'll go ahead and close my Actions. I really want to focus in on the History. What I'm going to do is point out the History brush that we have, the icon right there, great. Now when I click on the History brush, I can then paint across my image, make my brush a little bit bigger and when I paint across my image, what I'm going to do is I'm going to paint back to an earlier era of time. What era am I painting back to? Well, this era here.
So I can go ahead and paint across the image and remove everything. Okay well, that's kind of interesting. Let's now step back to when we had those brush strokes. Bringing this back over here and looking at a little icon, we can actually move this icon. Now we know that this was 2009, this is 2008, this is 2007. So I'll click here. Now when I paint across the entire of the image, all that I'm going to do is paint back to that particular time. So one of the things that you discovering is that you can use the History palette in kind of a linear way, simply press Command+ Z on the Mac/Ctrl+Z on the PC to go forwards and backwards or you can step back or Undo multiple steps that you have taken. on a Mac/Command+Option+Z, on a PC Ctrl+Option+Z or you can use the History panel.
Now keep your mind what the History panel is doing is remembering or taking note of what you have done. In the Layers palette, we have all of that content here. Now another way that we can deal with this content is to grab the Eraser tool. Now when I grab the Eraser tool, I'm not thinking about History at all. All I'm doing is clicking in this Layer, Eraser tool and now I'm going to go ahead and make my brush big by pressing the right bracket key and then I'll click and paint all of these brush strokes away. So one of the things that we discovered here is that you can do the same thing a couple of different ways. Now History gave us a little bit more flexibility than using the Eraser tool. So which technique is better? Well, there isn't one technique that's better. Rather, it's important to know a little about Layers.
It's also important to know a little about History so that as we begin to build our Layer documents we know how we can Undo or Redo all of the different types of adjustments and corrections and edits that we are making on our images.
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