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Illustrator allows you to create effects that involve pixels. Now you're not creating pixels but Illustrator is going to have to generate pixels in order to create effects like glows and shadows. So here on the little bear, there are some little shadows that add depth, and they look pretty good until you zoom way in and then they look really pixilated. So these are not literal pixels yet, they won't really become literal pixels until you export this to PDF or you hit File Print, in that print stream there'll actually be pixels. Lucky for us, we can change the resolution of this because they aren't pixels yet.
The way that's controlled is up under Effect > Document Raster Effects Settings, and right now it's set to be really pitiful, it's 36 pixels per inch, so if I'm going to send it to print, I'm going to change this to 300 pixels per inch and watch what happens when I click OK. All that pixilation is gone because now these pixels are going to be 300 pixels per inch. When you create a new document, you might take a note down here at the bottom under Advanced, what that PPI is, and if you choose that Print Profile as a start it's always going to be 300.
But if you inherit a file from somebody else, you might want to double check if there were shadows or glows. Take a trip up here to Effect > Document Raster Effects Settings and make sure that that resolution is appropriate for the way this document is going to be used.
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