![]() Or simply select all and use Object > Rasterize then save for web. If it does not, you may need to manually flatten areas where the lines are appearing before saving. This will most often correct the issue for those formats. If you are seeing these hairlines when saving for a web format (jpg, png), you want to be certain to choose Art Optimized as the anti-alias setting in the Save for Web dialog. Again, this is only for PDFs distributed online and not bound for a commercial press. This eliminates the stitching issue for on-screen display. Additional for online stuff.įor PDFs which will be distributed online and are not designed for commercial printing, it is best to save the PDF as Acrobat 7 (PDF 1.6) or higher. Although, I've not run into any problematic issues using PDF/X-4 when needed. ![]() Check with your print provider to endure they will accept a PDF/X-4 file. However, the PDF/X-4 is a newer PDF version and may require newer equipment (software) on the part of any prepress department. This will eliminate the stitching and still provide a press-ready file. PDF/X-4 is not a flat format and the "stitching" isn't necessary for PDF/X-4. If you're creating a PDF for print production and you just can't bring yourself to ignore these hairlines, you can save as PDF/X-4 rather than PDF/X-1a. They may have tips or tricks which relate to their specific process.įor a sure-fire, no-doubt, absolutely effective, non-wavering, method. ![]() If a print provider is not actually using a "press" but rather using a fancy "copier/printer" for production, these lines may still be an issue. It's not that much different than a color printer one may have at their office. ![]() A "digital press" is really just a high-end color copier/printer. The problem may be that reproduction has changed in the last couple decades and there are far more online printers using "digital presses" for reproduction. I've been ignoring similar hairlines for decades for commercial presses. They will absolutely disappear on a commercial press. These more recent PDF formats support transparency and will not flatten the file, thus won't result in the stitching due to flattening.įor most print work I recommend saving to PDF/X-1a, Acrobat 4 (PDF 1.3) format and simply ignore the white hairlines. Essentially anything as Acrobat 6 (PDF1.5) or higher. If your'e generating PDFs and this is an issue.įourth, you can save/export the PDF to a PDF format which is not a flat file format. The above items may remove the hairline appearance entirely for proofing press PDFs. In addition, ticking "enhance small lines" and "smooth images" may also help (same screen as below). ![]() Third, set the preferences in Reader or Acrobat to Always use overprint preview. Most other PDF viewers have display issues once you start getting into more complex PDFs than what Office spits out. Second, use an Adobe product to view PDFs. They are designed to show the PDF as best as possible so it can be seen - generally there's no attention to more advanced PDFs containing print production items such as spot colors, overprints, etc. The browser plug ins used to view PDFs are not designed to render everything absolutely accurately. There are a few things which may help the on-screen display.įirst, never view print proofs in a browser window. These don't show when the art is printed on a printing press. (A "digital press" is a actually a copier and not a press, please continue reading.) These hairlines will absolutely disappear when the PDF is printed using a commercial printing press. These are flat file formats and require art not contain transparency for proper rendering. If you zoom in or out you will most likely see the lines disappear or appear in other areas, but will never increase in size.Īs a print proof it's most likely that the PDF is in PDF/X-1a format or Acrobat 4-5 format. These hairlines are due to flattening, anti-aliasing, and overprinting.Įssentially they show the seams between where transparency has been flattened to preserve appearance. ![]()
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