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Ever since I started using OS X, I have noticed strange rendering artefacts when viewing PDFs I create using pdfTeX, XeTeX, or LuaTeX using Preview.app. These artifacts are not always reproducible, but they do appear frequently. Interestingly, I have not observed these artefacts when viewing PDFs that I download from other sources. When I select the text (e.g. using Command-A or my cursor), these artefacts disappear. Do you have any idea what might be causing them, and what I can do in order to fix the issue?

I have attached an image that contains several of these rendering artefacts below.

enter image description here

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closed as off-topic by Joseph Wright Aug 17 '13 at 6:01

This question appears to be off-topic. The users who voted to close gave this specific reason:

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What PDF viewer are you referring to? –  egreg May 19 '13 at 21:47
    
@egreg Preview.app --- the default viewer on OS X. –  void-pointer May 19 '13 at 21:50
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I'm not experiencing them; I rarely use Preview, preferring Skim, which however is based on the same PDF toolkit as Preview. It may happen that under certain conditions rounding can cancel some pixels or misplace letters, particularly at small magnification. –  egreg May 19 '13 at 21:57
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This is likely an artifact of Computer/Latin Modern as it has some very thin areas that fit badly on a computer screens pixel grid. Have you tried other pdfs using Computer Modern? It could also be an artifact of TeXs concept of "glue" between paragraphs. This changes vertical spaces and may have an impact on the pixel snapping algorithm of preview.app. –  Tobias Schula May 20 '13 at 2:43
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Make sure you don't have screen-zooming in effect. –  morbusg May 20 '13 at 9:19

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