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For example, the mu in \SI{1.55}{\micro\metre} looks really bad for some reason. For textcomp, \textmu looks the same.

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That's weird. Same problem here. I paste an example compiled with texlive. tinypic.com/r/2hekgsx/7 –  Tomas Nov 4 '10 at 13:13
    
That is weird... If you had a list of all the symbols that look rasterised, that might help solve the problem? The maintainer of siunitx is on this site, so I expect a good answer soon... –  Seamus Nov 4 '10 at 13:28
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Install the cm-super fonts or use \usepackage{lmodern}. –  Ulrike Fischer Nov 4 '10 at 14:07
    
@Ulrike: can you put that as an answer? –  Willie Wong Nov 4 '10 at 14:09
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I tried with texlive 2010 (MacTeX) and it looks fine. Here's the version of siunitx: {siunitx} {2010/07/15} {2.0n} –  YuppieNetworking Nov 4 '10 at 14:53
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1 Answer

up vote 9 down vote accepted

Turning Ulrike Fischer's comment into an answer: This happens because you are using the type 3 versions of the TS1 encoded fonts that are accessed via the textcomp package. There are 2 simple ways to resolve this.

  • Install the cm-super fonts, via whichever mechanism your TeX distribution allows (these fonts are very standard and should be available for every major TeX distribution, but since they are quite large they are not always installed by default).
  • Put \usepackage{lmodern} in the document preamble, to use the Latin Modern fonts.

Both of these options should fix the problem of using type 3 symbols, and should have only very minor effects on the rest of the document. The first option should only change the problematic glyphs; the second option will also cause very slight changes to the whole document (you may or may not view these as improvements, or you may not even notice since the difference is very subtle).

See Latin Modern vs cm-super? for some tips on the difference between lmodern and cm-super.

See Finding ‘8-bit’ Type 1 fonts on the UK TUG FAQ for some more background.

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I'd been toying with posting Ulrike's comment as an answer also, but I thought she might return and do so herself :-) –  Joseph Wright Nov 6 '10 at 15:52
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