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In this movie, we are going to take a look at actual resolution versus effective resolution. I want to go ahead and look at this image in Photoshop. So from the flyout menu, I am going to choose Edit With > Adobe Photoshop. Now, I want to find out what the resolution of this image is. So from the Image menu, I am going to pick Image Size. I notice the resolution is 240 pixels per inch, which means if I place this into an InDesign document at 100%, I would have a 240 pixel per inch effective resolution and also actual resolution.
At 100%, they would be the same. Well, let's go ahead and look at what happens if I scale it. I am going to go back to InDesign and I am just going to make a new InDesign document. I am going to place that image in there and go ahead and scale it. I initially placed it at 100%, and when I look at my Links panel--let me just open it up here a little bit-- I can see both my actual resolution and my effective resolution are the same. Again, that's because it's at 100%.
When I scale this image, that's going to change. I am going to go ahead and scale this 120% and notice my actual resolution of course stays the same, but my effective resolution now is 200 pixels/inch because I scaled it up to 120%. I never want to go less than 200 pixels per inch, so in this case I don't want to scale this more than 120%. So using our Links panel, we can keep an eye on both the actual resolution, which gives a good indication how much we can scale it, and then also the effective resolution, which is the new resolution after it's been scaled.
The Links panel will help us when scaling images to make sure we don't scale the images too much and the image resolution drops below 200 pixels per inch.
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