Measuring type size and line space


1. Three basic characteristics: dimensions of letters

  1. The vertical dimension of a line of text can be indicated by the height of a lowercase x.

  2. The distance between lines can be measured from baseline to baseline.

•  In latin scripts, the curves of some characters (a, e, o, s, c) extend a

   little bit above and below the x-height. This is done to make these  

   round characters look as large as the characters with flat tops

   (k, w, x, z). Tobias Frere-Jones gives a detailed description.

If you cover the x-height by a black bar, it is just possible to see the round curves above and below it.

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