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Due to slight differences in PDF -> PNG conversion on different platforms,
the "difference images" may show a lot of highlighted pixels, especially on
rendered text.

To get around this problem, first make sure that the differences reported
by the tool are really only marginal font-rendering shifts. Then create 
your own set of reference images with the following command:

$ ./ --create-reference <REFDIR>

This will create a new set of reference PNGs rendered with your font engine
to the directory <REFDIR>. ATTENTION: the directory you specify here will be
deleted and recreated!

After the images haven been created, you can use your reference dir for
your test renderings:

$ ./ --ref-dir <REFDIR>
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