In order to talk about these next couple of brushes, the history brush and the art history brush, I first need to explain to you how the history palette works. And if you are not seeing the history palette, bring it up on your screen by going to the window menu and choosing history. The history palette records all your actions in Photoshop. And you could see here that I have a collection, a list of various actions here. The actions at the bottom are the most recent, going back through time to the top, which would be the first action here. And you can also see on my history palette that I have a couple of these thumbnail graphics here. The history palette always gives you one history state of your unedited image when you first open it, and that's this first one. But I've created something called the snapshot, and you can create a snapshot at anytime, and it just creates a saved state of the image at this particular point in time whenever you created this snapshot. Now, it's important to remember that these saved states or snapshots are not actually saved with your document. So if you close this document, all the information in your history palette is lost. So keep that in mind when you are working with your history palette. You can use your history palette as a great way to get back to a certain edit that you have created, and before I talk more about that - How many histories can you save? Well you determine that in your preferences under the edit menu>preferences in this particular operating system. And I'm going to go to general. History states 20 - so my history palette will save the last 20 edits that I have, and if I go past 20 it will start to delete the older edits in favor of my newer edits. Well you can see that I have couple of things going on here. Currently my last edit is currently selected in this case my brush tool. And what I did was I used my brush tool and painted this cow green. But if I click on the history before it, well there must have been a slight edit there - see if we can see the difference, not very much. I'll go to the next one and indeed I can see that this next one was using the smudge tool, where I smudged this cow back here. I can back up my smudge, and you can see that each time I move backup a history state, it's essentially undoing. However, when you use the history palette, you can of course redo by simply jumping to a particular one of your history states. So here's my first smudge effect, and then the gradient I added to the bottom of my image, and finally levels. So in this way, we can jump to any particular state of your edits, say if you wanted to, you didn't particularly like this green cow edit you made, but you did like the smudges. So I could go to the smudge edit and then start to edit my document again. Say perhaps just paint with a particular color. And notice now that all the edits underneath that last edit of the smudge have been deleted, and my new edit has been replaced - the brush tool mark that I just made. It's a great way of using your undos in this graphical format. Another nice feature of the history palette, as I mentioned, is that you can save snapshots of a particular moment in time that you've created your edits. So I'm going to undo that last edit, and you can see that I have two snapshots here. And as I mentioned, the history palette always saves the snapshot of when you first open your document. And here is a snapshot that I made before I started smudging my cow back here and before I colored this cow green. So I can begin to work on this snapshot from this particular stage. And now notice that all my other history states have been deleted in favor of my new edit. So, I'll go ahead and make another change here. I think I'll just fill my entire image with a slight green wash. I'm going to use my foreground color at about 20%, and you can see that effect. And at this point, I'm going to click this button which will create a new snapshot. And so now I can bounce back and forth to see the different states or different stages that I have created these edits, so here's snapshot-2. We are already looking at it. Snapshot 1, before I made that edit of filling with color, and of course the very first edit, which will be opening my document looks like that. We have some other options with our history palette. If you go over to the history palette menu button, it brings up some menu options for history palette. We can of course step forwards and step backwards in time. Well we can't really step backwards since we don't have many history edits since I created a new snapshot. Can create a new snapshot this way, or as I just showed you click on the camera icon at the bottom of the palette. Delete the item that is currently selected, in this case my snapshot. Or clear all my histories, and if we choose clear histories, notice it does not delete the snapshot. So I can always go back to whatever snapshot state I want simply by clicking on the name or thumbnail icon. To choose history options, you can see some of the options that we have, and one of them is allow non-linear history. This is a convenient way of really manipulating the history palette. This way you can simply begin adding edits at any point along your history time-line.
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