Fix hairlines

Very thin lines, called hairlines, are problematic in offset printing. If left as is in PDFs, they might not appear in the final printed piece. The Fix Hairlines tool can find most hairlines and replace them with a heavier weight line.

  1. Choose Advanced > Print Production > Fix Hairlines, or select the Fix Hairlines tool  on the Print Production toolbar.
  2. Enter a width for the hairline you want to find, and enter a replacement width.
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    Adjust hairline widths using increment arrows. Shift-click arrows to change widths by whole integers.


  3. Select the unit of measurement from the Units menu.
  4. (Optional) Select Include Type3 Fonts or Include Patterns to replace hairlines in Type 3 characters or patterns with the same replacement width as other hairlines.

    Font characters and patterns can be used in a variety of contexts in the same document (for example, different magnification values), so changing the line width may produce unexpected results. Check the results if you select these options, and adjust your selections as necessary.

  5. Specify the pages to check.