Are the polka dots white or hollow? If white, add a second fill to the object, move it below the pattern fill in the Appearance panel and set it to white (or whatever color you expect the dots to be.
You could also turn off anti-aliasing in the preferences, but that may have other undesired effects.
the polka dot is white. I create the white shape first, then i put a brown box align exactly at the corner and put underneath the white shapes.
turning off the anti aliasing in artwork in preference is much better. it does eliminates some fine lines. however this cann't do it completley. see the screen shot below.
thanks for the tips on making dots and rotate at 45 degree. that help for the polka dot pattern. However, i am also creating other complex patterns. I certainly need a method to eliminate the annoying fine lines.
I did this with a pattern swatch of one white dot on a brown square (see top).
Then rotated the pattern to get the 45 degree look.
No visible joins anywhere. And even if there were I suspect that they would only be screen artifacts that would not print. At least, I have never had any trouble with those lines that sometimes appear in patterns.
I create the white shape first, then i put a brown box align exactly at the corner and put underneath the white shapes.
In CS5, make sure the infernal Align To Pixel Grid feature (default) is turned off.
Then, describe exactly, step-by-step, what you did to create the pattern. Don't leave out any steps.
Your first screenshot of the pattern artwork actually shows a hairline stroke. If you involved Pathfinders in order to create the quarter-circle shapes, you may have in fact created hairline strokes, depending upon the exact steps you used. Bugs in some of Illustrator's Pathfinder operations result in hairline strokes (stroke weight of zero), which is not even supposed to be allowed in Illustrator.
Drag the Pattern Swatch out of the Swatches palette and drop it on the artboard. Ungroup it completely. Select the individual objects one at a time, checking the Stroke palette to see if any of the objects have a stroke weight of zero (as opposed to empty).
thanks for your thourough explaination. where is the align to pixel grid feature? can't find that. I have check each of my graphics. there is no hairline stroke or (zero stroke weight) thing.
here is the screen shot of the steps i was doing
1. draw the shapes i want with the a quarter circle at corners.
2. fill the back with black box. Each side of the black box is align perfectly with the edges of quarter circle.
3. drag the step 2 shape into swatches to define the pattern
4. fill a rectangle with that pattern
5. export the rectangle to a 300dpi jpg.
this is the jpg looks like.
i understand i can use one circle and rotate at 45 degree to get rid of the line. However i am also creating other more complex graphics besides the polka dot ones. The same problem occurs. it would be great if i can solve it.
where is the align to pixel grid feature? can't find that.
Align to Pixel Grid is described in the documentation.
I can reproduce the problem in both CS5 and CS3.
Turn off the Anti-aliased Artwork option in Illustrator's General Preferences. Turn on the desired antialising method in the JPEG export dialog.
thanks for the tips on making dots and rotate at 45 degree. that help for the polka dot pattern. However, i am also creating other complex patterns.
Rotating the Pattern independently from the object should be a huge help to you in creating other complex patterns; it allows you to stagger the rows without a bunch of tedious cutting or needless masking. You might also consider adding the background color as a separate object fill, rather than making it part of the pattern artwork.
I've been having this same issue! I have seen it happen even when I use a "placed image" JPG turned into a pattern swatch. Unfortunately it DOES print out, at least in the high-end digital offset printing I'm using.
See my attached screenshot. I put the pattern next to each one so you can see. Same as what Tricia said, the alignment is PERFECT -- it isn't an issue with the vectors being improperly aligned or different sizes. I have checked their exact size, alignment, and triple-checked in outline mode to make sure they are lined up exactly.
JET, I don't completely understand what you are doing... would you be willing to explain further? I have some complex fabric patterns which I've been creating (way more complex than these polka dots and stripes) and I'm concerned about it. Actually I'll attach a sample of that too.
I tried turning off the anti-aliasing and gosh it looks so pixelated and icky I don't think I could work like that and I'm a little scared to print with that setting turned off?!
I think I found a solution, or at least a workaround.
I made a pattern with Illustrator that showed this annoying hairlines. Then, instead of copy+paste as Smart Object inside Photoshop (where I get the hairlines anyway, and it prints out!) I export my illustration as PSD , choosing not anti-aliasing in the exporting options. Then I use File > Place... inside Photoshop and the pattern appears without hairlines.
Hope it helps!
I am also having the same problem. I have tried all the remedies except the export remedy. I produce illustrations and patterns to sell on products and stock sites and I can't sell the patterns because they show up like this on the product as well as previews.
Jees can someone from Adobe step in and give us an answer? It is obvious this is a problem for many people.
Those fine-line tiling artifacts will often persist when you export a .jpeg or png with anti aliasing set to "type-optimized" or "none," so check "art-optimized" anti-aliasing when you export. Also, in a high quality tiff export you won't see them.
Technically, if they are merely tiling artifacts (and not a problem with the repeat), they won't print. So that's one way to check if the lines are just an artifact in the screen display of the pattern, or something intrinsic to the art. Another way to check is to zoom in and out on the art - if the lines dissappear at some zoom levels, then they are likely tiling artifacts.
although this is the illustrator section of the forums, i was wondering if anyone would know how to eliminate the same lines but in photoshop cs6?
im experiencing the same problem, occassionally in photoshop there are lines between the tiles once they have been repeated and cant figure out how to fix it!