[OS X TeX] LaTeXiT and transparency

[Piet van Oostrum]

>>>>> Jens Noeckel <noeckel at uoregon.edu> (JN) wrote:

>JN> that's what I thought, too, since copying a PDF from Preview does  indeed
>JN> preserve a transparent background. But that's not what seems  to happen
>JN> when you try exporting from Preview as GIF. Instead, the  white background
>JN> is exported as NON-transparent white - and I don't  see a switch to turn
>JN> this wrong behavior off. If I give Preview a  transparent PNG, though, it
>JN> really shows the background as  transparent, showing the default background
>JN> color you select in the  Preferences (dark gray, e.g.). I wonder what the
>JN> point of that  background setting is, anyway, if Preview respects it
>JN> sometimes and  not other times.

I think Preview does not support transparency in PDF. When you open a
transparent PNG image, for example, it shows the background in gray, and
when you save it as GIF, there is a checkbox for preserving the alpha
channel, and the GIF will be transparent too. But when you save as PDF, it
looses the transparency, and the background becomes white.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4]
Private email: piet at vanoostrum.org
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