[OT] Ai hairline pattern problem

[katmcg]

Any way to fix a hairline problem in a pattern?

When I make a pattern in Illustrator cc using this file, I get a hairline where the pattern repeats. Initially I thought it was from anti-aliasing. A proof was printed out at 300dpi and the hairlines were not there.

I have a google drive link of the file:

https://drive.google.com/file/d/0B51oVfF8SXQ2U2pucVZYXzZIOXc/view?usp=sharing

But when printing plates were made at 2450 dpi the hairlines were visible. So it seems there is something wrong with the pattern and I don't know how to fix it.

I've read on forums about anti-aliasing and exporting using "Art Optimized- supersampling" etc. but I think the pattern is mathematically not accurate.

[William Adams]

On Jun 19, 2015, at 1:51 PM, katmcg wrote:

> I've read on forums about anti-aliasing and exporting using "Art Optimized- supersampling" etc. but I think the pattern is mathematically not accurate.

More likely the flattening by Illustrator to make a .eps isn't working out.

Save in a format which includes native transparency support, then make the printer responsible for flattening it out to pixels in a fashion which matches the requirements of their equipment.

I suspect you'll be able to see the lines if you open the .eps and rasterize it @ 2,540 ppi in PhotoShop (remember to turn off anti-aliasing) --- got tired of waiting for it here.

William

--
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.

[Michael Brady]

Kathleen

> When I make a pattern in Illustrator cc using this file, I get a hairline where the pattern repeats. Initially I thought it was from anti-aliasing. A proof was printed out at 300dpi and the hairlines were not there.
>

> ...

> But when printing plates were made at 2450 dpi the hairlines were visible. So it seems there is something wrong with the pattern and I don't know how to fix it.

I opened the file in AICC15, copied and pasted it into IDCC15. It came in as a group of vector objects (not an .eps). I aligned the with 0 space betweenthem. Then I enlarged the group and saw a faint line at several percentages, but not all. There is no hairline visible at 4000% on my 27” iMac (not Retina). It seems to me to be a display artifact, but you said you saw it on the plate. How big are the hairlines on the plate?



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Michael Brady

[katmcg]

Working from Michael and Williams comments my friend finally figured it out. Cosmic group consciousness succeeds again!

There was nothing wrong with the pattern itself.  It was only when resized and then made a pattern with the resized file that it became off but a hairline when magnified at 6400x. "expanded" the pattern and used preview mode:

Did five other patterns, resized them, and then made patterns with them and they all worked fine. Anti-aliasing tricking the eye didn’t help.

kat

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[Stephen Marsh]

Kat also posted over at LinkedIn in an Illustrator group, this was my reply:

Hi Kathleen,

Nothing initially leaped out at me as being wrong with the tiled pattern, it was a true square etc.

When tiled in Illustrator, the tile edges are indeed visible. This repeats if translating the tiled vector in Photoshop at high pixel resolutions (simulating what would happen in a RIP).

When using the Illustrator rasterize command to turn the vector tiled fill into a raster image directly in Illustrator, the lines disappeared and the image was perfect and when extracting the image from the PDF for inspection in Photoshop I could not find any tile edge white lines.

Stephen Marsh

[CatG]

I am having the same issue with Illustrator. A client has requested an image from Shutterstock and when I open it in AI I get these lines. I have exported as an EPS into InDesign and the issue is still there when exported to PDF. I then opened the EPS in Photoshop and most of the lines were gone. Not all. This has helped but I would really like to use the eps directly in Indesign instead of going through the entire process for a number of jobs that all require the same image. This is clearly not a preview thing since after flattening the eps in Photoshop some of the lines are still there. Any help will be greatly appreciated. Thanks ;-) PS: Working in the latest version of CC.