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Earlier, I talked about Previews and kind of gave you little overview, but there is more you can do with them. Since they're so important in your overall Aperture experience, I want to dig a little deeper into managing these previews. Now just to review, previews are the JPEG images that Aperture generates to share with other applications for you to view, all the good stuff. So even if you start with the RAW file, a JPEG preview is generated.
previews by going up to Aperture > Preferences and going to the Preview tabs. Here is where we set some things earlier. For instance, New projects automatically generate previews. That means when you're bringing stuff in to the library, you're telling Aperture it's okay to generate previews for them and that we want to share those previews with other applications and throughout our computer. But here is what I to focus on right now, which is how big is that preview going to be.
If you want it really big, because you're going to use it for slideshows and so forth, then you would pick one of the larger settings. However, that takes up more file space. Then of course, generally speaking, if you want to use less file space or your dimensions don't need to be as large, then you can choose a smaller one. Okay, so you have your choice. So let's say that you set up your preview a certain way, in this case the previews that were generated for this project we're looking at were 1920x1920. What that means is that the longest side is 1920.
Then the other side is whatever is proportional at eight compression level. All right, that's great. But for a couple of images, I decide that I want something smaller or larger. How do I do that? Well, the way that you do it is that you go ahead and make the setting change here in Preferences. So we want to generate a smaller preview. Let's say we want to update the previews, so that's the smaller size. Let's say 1280 X 1280.
I go ahead and make that change here. Now here, the preview has already been generated for this file. We can see what size it is. We can double check in here. What I'm going to actually do is change the interface, so we can do some dragging and dropping. By the way, this is a great tip for knowing if you even have a preview or not. If you can take a thumbnail and drag it out onto the desktop, then it has a preview. That's the way that works. Now this preview has already been generated.
So let's double-click on it and we'll go to Get Info. Show Inspector and we'll see that it was set up under the previous preview dimensions, 1920 on the longest side. That's great, but now we have changed our preview dimensions. So I'm going to go ahead and move this to the Trash, because we went to Preferences. We said now we want to generate a preview at 1280 instead of 1920. Okay. Great! So I click on the image and then I can go a couple of different routes.
So I can go up to Photos and I can click Update Preview. Aperture is going to tell me that the preview selected is already up-to-date. Well, yeah, it is up-to-date to the old setting but not up-to-date for the new setting. So what we want to do is force Aperture to generate a new preview for the new setting. In that case, we have to hold down the Option key when we choose this menu item. All right, sounds good. We are selected. We'll go back up to Photos.
Now look what happens down here when I hold down the Option key, so it goes from Update Preview to Generate Preview. So I'm going to hold down the Option key. I'm going to make the selection. Aperture is going to do a little work behind the scenes. Now let's check our work. We'll go ahead and just to drag this off. I'll double-click, we'll open it up, we'll go to Tools and then Show Inspector. Now it has generated a new preview at the new size that we want.
You can do this for multiple images at once. So this is the way that you can actually change the preview on the fly. I'm going to go ahead and close this. We'll go ahead and delete this. So we just go ahead and move it to the trash. We will tidy up our interface to the way that it was before. Then I go, okay, now this preview is out of step with the rest of the previews in this particular project. I should change it back. So all I'm going to do is go back to Aperture, go back to Preferences, go back to Previews, change it back to the size of the other ones. Close this.
Go up to Photos, hold down the Option key, regenerate that preview and now it's the same size as all the other ones. By the way, another time that previews are generated is if you go to make a slideshow. So if you've made changes to your preview settings, and you don't want to regenerate the previews, you can just run the Slideshow function. Select them and run Slideshow. Because part of what Slideshow does is that it regenerates new previews if there has been changes. So that's another way to do it.
This gives you more control over those of JPEG images that you have and you can change them on the fly if you need to. This is the way that you do it.
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