Font size units in imagettftext?

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The PHP manual has this note regarding the GD imagettftext() function:

      The font size. Depending on your version of GD, this should be
      specified as the pixel size (GD1) or point size (GD2).

To accurately use point sizes, PHP+GD would have to know the actual
output device resolution, which is impossible.  I think PHP+GD just
assumes a resolution of 72 pixels per inch, for TrueType font sizing.
Therefore 1 point equals 1 pixel, so the above note is meaningless
since the font sizes are still in pixels. Am I wrong?

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