Why do my high resolution pdfs have thin white lines all over them?

When I make high res pdfs to send to the printer, they often have thin white lines in them that seem to be very visible when they are displayed in email. This panicks my clients. When the files are opened in Acrobat, they look OK most of the time, but sometimes they still have the white lines. What causes this and how can I make it STOP!!! It is driving me and my clients nuts.
I am using Acrobat 8 Professional on a iMac OSX 10.6.8. My files are pretty standard for print pubs. They usually contain type and images, and the images get the white lines where the text boxes are in the source file. It is maddening.

I forgot to say that I am creating source files in AI CC if that makes a difference, but I have had this problem in the past with previous versions of AI.

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Hi there,
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If this has something to do with not flattening my artwork before I create a PDF, then how do I do that?
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You are giving him a PDF file.
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Problem with Thin White Line in PDF

I am encountering an appearance issue in a pdf created from a FrameMaker 11 file, using Adobe Acrobat X Pro and Adobe Acrobat Distiller X. The pdf displays a table that has black lines running vertically between every other column. In the column in between these lines, there appears to be a thin white line displaying. If I enlarge the pdf to 200%, the white line disappers. I right-clicked on the pdf and in the menu under "Page Display Preferences ...", I chose "Page Display" under the "Categories" column and then "Rendering". I then iuncheck the "Enhance thin lines" feature and this removes the thin line from the pdf. However, if I process another pdf for a different FrameMaker 11 file, the "Enhance thin lines" feature is unchecked and this affects the appearance of these other pdfs. Consequently, I need to reselect the "Enhance thin lines" feature in order to process these pdfs. However, if I reselect this, I'm noticing that when I open the pdf that has the thin line issue, the thin line is visible and the "Enhance thin lines" feature is selected. Is there a way to adjust this, so that the "Enhance thin lines" feature is removed for only this one pdf, but is selected for the other pdfs?

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Hi There,
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Thin white line between line art and live paint fill?

I am using live paint to paint cartoon character illustrations. The artwork is brought into Illustrator CS3 and live traced. Then I convert it to a live paint group and use the paint bucket to fill. Everything looks fine no matter how much I zoom in. If I bring the AI file into Photoshop CS6 I can see a thin white line between the black line art and the fill. This is most noticeable where black meets black. I can also see this sometimes in file previews while browsing through files. If the white line cannot be seen in Illustrator is the file ok? I did just upgrade to CS6 if that would make a difference.
Thank you for any help.

If the white line cannot be seen in Illustrator is the file ok?
Without knowing specifics,nobody knows.
"Okay" for what?
If it looks okay to you in Illustrator, then it's okay for viewing in Illustrator.
If the export of it does not look okay in Photoshop at 1:1 or higher zoom, then it's probably not okay for whatever you're going to do with that raster image.
If it's printed to a low-res composite printer, then it may be okay, because the printer may not be able to resolve the whitish pixels.
If it's printed for commercial (color-separated) reproduction, it may not be okay, depending on the scale at which it will be printed, and on other considerations partially described below.
The autotrace routine does not build traps. Typically, when you color-fill cartoon line art manually, you don't make the shapes that define the fills merely "kiss" the black line work, as would the default treatments of a stupid autotrace. The black line work typically overprints the fills, thereby creating printing traps.
Suppose a portion of your cartoon is a hand-drawn closed circle. The black line work is irregular; it varies in width, having been drawn with a marker or a brush. The circle is colored in with a medium green. There are no sloppy gaps in the original between the green and the black.
You scan it and autotrace it. Unless you apply some deliberate care to make it do otherwise, the autotrace is going to create a compound path, filled with black, and with no stroke; and a green simple path which (hopefully) exactly "kisses" (abuts) the black path. Adobe's on-screen antialiasing of the edge where the two colors abut may or may not cause your monitor to display a faint whitish or grayish sliver between the two colors.
Similarly, Photoshop's rasterization of it, or the rasterization of a raster export filter may do the same, and may actually result in some off-color pixels along the edge. (Your description of the scenario kinda raises the question of why you are auto-tracing something that you're then just going to rasterize in Photoshop anyway. Why do that? Why not just work with the scan in Photoshop?.)
So let's leave Photoshop out of the picture and assume you are autotracing it because you want vector artwork. You zoom way in to see if the whitish sliver enlarges. It doesn't, so you assume it's just an aberation of Illustrator's on-screen antialising. And then someone tells you you're in the clear. But are you? Not so fast.
Let's assume the artwork is destined for commercial (color-separated) printing. Further assume the color of the autotraced black is 100% K, and the color of the autotraced green is 100Y 50C. Three inks involved. None of those three inks are shared between the two objects. So even if the paths do, in fact, perfectly abut, there is no "wiggle room" built in for the minor alignment shifts that almost aways do occur on press.
Bottom line: Even if you do determine that the common antialiasing aberations that frequently occur on-screen in Adobe apps is just that—just an onscreen aberation, that does not necessarily mean your file is suitable for commercial color-separated reproduction.
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You have options. Illustrator provides an auto-trapping feature. Read up on it in the documentation so you understand what it's all about. Alternatively, you can expand the results of your autotrace, select all the black linework and apply a composite color that includes 100% K and reasonable percentages of C, M, and Y (a so-called "rich black"). Or,depending on the artwork and the desired results, you may consider doing the autotrace as centerlines so you have stroked paths, not just filled paths for the linework. That way, using the flood fill (so called LivePaint) will cause the auto-created fill objects to extend to the paths, not just to the edges of their strokes. Then set the linework to overprint.
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JET

Why do my high resolution pdfs have thin white lines all over them?

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