kern Tables (Coming Soon)

Add a legacy kern table to TrueType fonts.

Applies to TrueType fonts only. Some applications like PowerPoint still rely on a legacy kern table or will not be able to use the font’s kerning.

This option will take great care to only include the most important kerning pairs based on language support and magnitude of the kerning value.

Language support is determined by the module jkUnicode with orthography data based on the Unicode Common Locale Data Repository.

Parameter

de.kutilek.corretto.kern

Format

max_pairs

A number larger than 0 and up to 10920.

Example

{
  customParameters = (
    {
      name = de.kutilek.corretto.kern;
      value = "10920";
    }
  );
}

Explanation: Add a kern table from the expanded class kerning, limiting the number of kerning pairs to the given number.

Considerations About Limits and File Size

You should not use more than 10920 kerning pairs, because this number is the maximum one kerning subtable can hold.

No known application will use more than the first subtable.

Also consider that a full kerning subtable will enlarge the font’s file size by 64kB.

It’s safe to add a kern table to an Export that will also be converted to a webfont with Corretto. It will discard any kern tables as they are not needed on the web.