Hi everyone,I have been asked to submit a piece as a PDF and the print shop says that whenever they insert a CorelDraw or Microsoft produced piece they see lines within background images. I'm attaching a screenshot to show what she means. Apparently they appear when they import the PDF into Illustrator. The only way they can and add it to the background in illustrator.Is this something anyone has seen before? I've been using CorelDraw for about 12 years and I don't think I've ever seen it happen or been told that anyone is having it happen to them.Thanks I look forward to hearing other people's thoughts.Phil
Phil Rose said:Apparently they appear when they import the PDF into Illustrator.
so WHY they import a PDF to illustrator? that's a crazy idea, if it's a PDF they should use Acrobat or send directly to the RIP. As an alternativem they can rasterize the PDF with Photoshop, then there's not "extra lines". It's a problem of the convert of PDF to a vector software (it could happens if you open a PDF with CorelDRAW too)
btw under newest CorelDRAW versions you have an option for adjust images to the pixel grid, select the image, right click and choose "object hinting", that should help. The reason of this line is a small difference (half pixel or less) between the image and the pixel grid
They open in Illustrator because that's what Adobe people do.
I would disagree, professional prepress uses Acrobat and or their RIP digital front end, which usually is Acrobat with the RIPs plugin. Any prepress that first opens a PDF in CorelDRAW or Illustrator is causing issues especially where special effects or complex files are concerned.
A CorelDRAW file creator that does not output their files has no need for Illustrator.
The problem has existed since Adobe decided to make PDF an EDITABLE Illustrator format. It is an incorrect prepress work flow to open PDF files in Illustrator or CorelDRAW. The proper work flow for prepress is Acrobat and the RIP's plugin or the RIPs PSF editor.
Illustrator will introduce errors in non Illustrator created PDF files. Illustrator editable PDF files create transparency and layering errors in output on most RIPs.
Therein lies the problem with the Adobe PDF mindset, leave editable Illustrator files as the AI format and save PDF files for output or distribution it resolves any confusion.
Many artists fail to learn the basics of pre press preparation and it makes working with them a PITA.
Now do some shops open all PDF files in Illustrator? Yes. I highly recommend that file creators find a more experienced output provider. We has the problem at our shop with an Adobe user, he couldn't get it through his head, he caused many errors so now he works somewhere else.