[OS X TeX] LaTeXiT and transparency

Piet van Oostrum piet at cs.uu.nl
Wed Jul 5 04:00:11 EDT 2006

>>>>> 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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