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In this movie, I'll introduce you to the four things you should know about saving an image in Photoshop. One of them's just an FYI. The other three rank among the best failsafes against losing your work found in any computer application. And this is a big panorama that I captured and stitched together, and it contains over 45 million pixels. I'm going to start off here by dialing in a custom zoom value, down here in the lower left corner of the screen. Then I'll price Shift+Tab in order to bring up my right side panels.
So I can show you what I've got here. There's three layers in all. At the bottom, we have a cropped image Layer, and then we have two adjustment layers, the first of which is warming up the bottom of the image, and the second is darkening the sky. And I'll tell you about cropping and adjustment layers, in upcoming chapters. But for now, let's say I decide to click on one of the adjustment layers, Shift+Click on the other so that they're both selected, and I press the Backspace key here on the PC, or the Delete key on a Mac to get rid of them. Now notice up here in the Title tab, this is the FYI part of the movie, we've got a couple of asterisks going on.
The one inside the parenthesis, that one's a little bit confusing. What that tells you, is the images using a color profile, that's different than the one that Photoshop is currently set to. And actually, it doesn't matter, because Photoshop automatically switches to the color profile employed by the image. So for now, you can safely ignore that first asterisk. We'll be discussing what's going on with color profiles and color settings in a future course. That other asterisk, however, the one outside the parenthesis, that one tells you that you have unsaved changes.
And of course, that means you could potentially lose your work. If you want to save your changes, you go up to the File menu and choose the Save command, or go ahead and press that common keyboard shortcut, Ctrl+S on a PC or Cmd+S on a Mac. And then you'll see that the image Saves, and that asterisk outside the parenthesis goes away. The problem, of course, is I didn't want to Save over my original image, I didn't want to lose those adjustment layers. And this is the kind of thing that can happen every so often. You accidentally Save when you don't mean to, especially if you use the keyboard shortcut.
Because right next door to the S key are the A and D keys, which you use all the time in Photoshop to either select everything, or deselect everything. So, it's easy to hit that wrong key. If you do, don't panic, because you can always go back in time. Here's how, go up to the Window Menu, and choose the History command. And then, you'll notice here in the History Panel that I have a state that's called Delete Layer, but I also have another state called Open, And if I click on that Open state I get my layers back.
I'll go ahead and now close the History Panel. I have unsaved changes, of course, so I'll go up to the File menu and choose the Save command in order to update the image, and bring back those layers. This works when you revert an image as well. I'll bring back up my History Panel and click on, Delete Layer. In order to go ahead and re-delete these layers, and then I'll go back to the File Menu and choose the Save command in order to overwrite the image. Now I'll click on Open once again. In order to go back to the open state, which contains the Adjustment Layers.
And if I go to the File Menu, you can see that I have a Revert command which allows me to load the saved version of the image. Inside any other program, when you choose Revert, you're going to get an alert message that says, really, do you actually want to revert the image and lose all the changes you've made? In Photoshop, you don't get any message whatsoever. It just goes ahead and reverts to the saved version of the image, because reversion is tracked by history. So notice here in the History Panel, I not only have a history state, but I've got all the other states before, in my case, just open.
So I'll click on Open to bring back the Adjustment Layers. I'll go ahead and close the History Panel, then I'll go up to the File Menu and choose the Save command, so I keep those adjustments. So in other words as long as you keep the image open, and as long as you have access to those historical states then you're safe. The only time you're not safe is if you do this number. Let's say I decide to grab those Adjustment Layers again and throw them away. And then I go up to the Close box and click on it, and Photoshop asks me, hey do you want to Save your changes? If I click on a Yes button or the Save button on the Mac, I'm in trouble.
Then, I do lose everything, because history is not saved along with a file. So, what's I'm going to recommend to you, don't do that. I'll go ahead and cancel out of there. And then, I'll make the deliberate decision, whether to Save my work, or not. One more thing you should know, you've now got another degree of protection in the form of autosaving. I'll go ahead and press Ctrl K, or Cmd K on the Mac in order to bring up the Preferences Dialog box. And then I'm going to switch over to file handling on the left hand side, and notice this check box, Automatically Save Recovery Information every so often.
What I recommend you do is switch it from 10 minutes to 5 minutes, so you have more protection and then, if you find that Photoshop is dragging performance-wise, then you can always up the number later. But I'd rather be protected than not. And I've been working in the program for a while now, and have retrieved several files, things that would have otherwise, in the old days, just absolutely have been lost. It's totally great, it protects you from crashing, and the idea is, if the program does go down, the next time you launch it you will see a recover file open automatically.
Now I'm going to go ahead and click OK in order to accept that change. So to recap, if you see an asterisks outside the parenthesis, that means unsaved changes. If you accidentally save a file, you may be able to still retrieve the original image from the History Panel. Reverting an image is undoable in Photoshop. And finally, you have autosave and auto recover in the events you crash.
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