sorry, I misspoke myself. The situation is more complicated than I thought.
It is true that the original file contains only true arc elements, no Bezier
curves. But when you edit it, you see the handles typical of Bezier curves, you
do not see the handles typical of an arc. (using the Node tool to draw this
distinction) The reason apparently is that the object has no sodipodi
attributes, which suggests that perhaps it was not created by Inkscape. In the
absence of sodipodi attributes, the editing and probably also the rendering
will be done using Bezier curves.
So the question is, why is the Bezier approximation so poor. The reason is
that the arc angle is too high. In the curved portion of the 'p', the outer
curve section is represented by only 2 Bezier curves and they both have an arc
angle greater than 90 degrees. The Bezier approximation to an arc very rapidly
becomes very poor if the arc angle is allowed to be higher than 90 degrees.
So the next question is, why is file p_new.svg better, after manually
expanding the image? Because this file contains 8 Bezier curves, not 2, in the
same curved portion of the 'p' character.
I suspect, but obviously cannot prove, that the approximation procedure
that converts from arc to Bezier probably has some numerical cutoff that
determines how many segments to use and that this cutoff value is in absolute
units not scaled units, so that when you convert a tiny image (200 times
smaller than normal) you get fewer Bezier segments than when you convert a
normal size image, leading to a situation where a very tiny image is not as
well-formed as a normal size image.
--
Bezier curves drawn, where svg file requires circular arcs
https://bugs.launchpad.net/bugs/653315
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