Hair line outside shape in pdf

[marijnt27831752]

Hi all,

I’m having an issue that when I place an image into a shape with a stroke, that I’m seeing a hair line of the image on the outside of the shape when I’m exporting to pdf. Anyone else having this problem and does anyone have a solution for this?

I already tried exporting to Acrobat 5 instead of 4.

Thank you in advance!

Marijn

[marijnt27831752]

added to that: it’s only when I have an inside stroke

[Bill Silbert]

Try exporting a High Quality PDF/X-4:2010 and see if that improves the quality and removes the hairline.

[Laubender]

marijnt27831752  wrote

added to that: it’s only when I have an inside stroke

Hi Marijn,

I think that's a bug we can already see with InDesign CS5 version 7.

As far as I know, there is no workaround other than not using inside alignment.

What you can try:

Use a different file type for the placed image.

Instead of e.g. JPEG use TIFF or PSD. Hm. Maybe PDF will work best.

What's your version of InDesign?

On what operating system?

Regards,
Uwe

[Eugenio.NYC]

Hi, are you exporting a pdfx-1a?

Do you have transparency or sport colors?

[Willi Adelberger]

If you place a PDF in InDesign use only PDF/X-4 for import, regardless what the printer asks for later. PDF/X-1a and X-3 or any other flattened PDF is causing problems on import.

[marcod10024907]

I think I have the same problem. In the print preview of InDesign everything looks normal but after exporting it to a PDF it looks like the image is cropped.

[Laubender · Accepted solution]

Hi marcod10024907 ,

can you show a screenshot of the issue?

What's your version of InDesign?

On what operating system?

What kind of PDF did you write?
Did you downsample image data while exporting the PDF?

Regards,
Uwe

[marcod10024907]

Hey Uwe,

thank you  the picture was downsampled by InDesign now it works

[Laubender]

marcod10024907  wrote

Hey Uwe,

thank you  the picture was downsampled by InDesign now it works

Hi Marco,

great! But it would be good if you could give more details.

I tried several things with InDesign CC 2019 on Windows, but could not recreate the issue.

So:

1. How how did you provoke the issue.

2. What did you do differently to avoid it.

Perhaps also important:

Did you clip the placed image?

What's the stroke weight value?
What color? Does it overprint?

A lot of questions. So it would be cool to see an example we can download where we can see the issue and one with the same image where the issue is solved. Use Dropbox or a similar service to provide the files and post a link here.

We could test both cases in several versions of InDesign on Mac and PC to see if it makes a difference and if the bug is perhaps fixed in the latest versions of InDesign.

Thanks,
Uwe

[G_Hoffmann]

I had tried to create a hairline, based on all suggestions, that is a compressed or an uncompressed

source image, different export modi for the PDFs and furtheron little or strongly  contrasting colors.

No hairline, but a very weak remnant of anti-aliasing at the boundary between the source image

clippíng path and the background, here the upper edge. Attention! the clipping path is the

outer contour of the ellipse and the stroke was applied INSIDE:

The PDF was opened in Illustrator, the image above shows a screenshot after an important test.

I have removed one quarter of the stroke. We can see, that the INSIDE stroke is actually produced

by a offset path with CENTERED stroke. The anti-aliasing between image and background happens

at the outer ellipse as clipping path, with or without stroke. The offset path for the centered stroke

is only an approximation* , therefore the clipping path and the outer stroke contour are not exactly

identical – thus we have weak rests of anti-aliasing.

* Offset paths for Bézier curves cannot be constructed accurately as Bézier curves.

In PostScript thinking the gray stroke isn't overprinting – it is overpainting in the virtual drawing,

removing parts of the image..

If this occasionally visible fringe should be the mentioned hairline, then the explanation may be correct.

If there are really hairlines, then it would be helpful to show an example.

All Tests by CS6.

Best regards --Gernot Hoffmann