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There may be times when you are working with a document inside of Illustrator that has already been flattened, meaning that the transparency has been removed from that document. That can happen either because you have flattened the transparency yourself or maybe you have actually exported some kind of an old EPS file that you are reopening again or it could also happen if you are opening up certain versions of PDF files as well. Now if I go into Outline Mode here, you can see that actually everything has been all broken up and chopped into pieces, some of the parts of the document have been rasterized, so on and so forth. But you may notice at times, when I go back here to the Preview Mode, that depending on different zoom levels when you kind of look at your file, you might see this like white lines appear on your screen at certain scenes of the artwork, like where images turn into vectors, so on and so forth.
When you see those white lines, you really are not sure are those white lines going to print or not. In fact, let's zoom in on some parts of this document right here. Let's say I'll focus just on this area right here. As I kind of go ahead and I click on here to try to zoom in, I might start to see that there are certain white lines that appear. For example, there is a white line that appears right here, a thin white line. I see a vertical one here appear as well. Let me zoom in a little bit more here and the funny thing is that these white lines sometimes disappear or they reappear at different zoom levels. So it kind of leaves you a little bit disheartened. You are not really sure. Is that going to print, is it not? Is it part of the file? For example, I have a white line that appears right here across my document. See how this white line appears? It kind of splits the artwork as it kind of goes here.
So I'm really not sure if I'm ready to release this file to print or not. I'm not really sure if the file is going to print actually with that white line in it. In fact, if I go into Outline Mode, I'll see that that's actually the boundary of where an image might bud up with a different image. So it's a valid concern to wonder whether or not that white line is actually going to show up on a printout, but in reality, that white line is there simply as a defect and Illustrator is anti -aliasing, in the way that it displays the graphics on your screen. If for example, the way that my artwork currently is being displayed on my screen, if it doesn't match up to the pixels on my screen, then I might see those thin white lines.
But that's only the way that it displays on my computer screen. That's why those lines appear or disappear as I zoom in and out of my document. In fact, if you were to actually turn off the Anti-aliasing feature of Illustrator, you would see those lines disappear altogether. In fact, this is the easiest way to tell whether or not those lines will or will not show up in a printout. I will open up my Preferences dialog box here inside of Illustrator by pressing Command+K on the Mac or Ctrl+K on Windows. I'll uncheck the option here called Anti-aliased Artwork and then I'll click OK. Now you will see that white line disappeared. Yes my artwork now does have jagged edges, but at least I know those lines are gone.
Since I now know that the white lines are simply an artifact of the anti-aliasing, I can be comfortable in actually releasing this file and sending it off to print. Once I have done that, I'll reopen the Preferences dialog box in Illustrator and turn Anti-aliased Artwork back on again. Even though I now see the lines again, I know that they won't print.
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