[OS X TeX] White vs. Transparent?

[Victor Ivrii]

On 3/23/06, david craig <dac at panix.com> wrote:
>
> What is the difference between white and transparent?
>
> Context: using LaTeXiT to generate equations for Keynote.
>
> Only the TEXT of equations dropped into Keynote appears on the slide;
> the background shows through.

Because background of equations is transparent. You can change it by
placing equation
in \colorbox{white}{$2+2=5$}

> However, if you color some characters
> white, they show up as white in Keynote.  So there is a difference in
> the pdf file between "white" areas and, for lack of better word,
> "transparent" areas.
>
> I would like to be able to make certain  portions of some equations
> "transparent".*  How can this be done?

invisible? $2+2\phantom{=5}$.

>
> David Craig
>
> *Why?  To use Keynote builds to build up a complicated equation
> piece-by-piece, yet have the alignment of parts of the equation remain
> in place so that you can't tell a new version of the equation has been
> built in.  Only way I can figure how to do this is typeset the entire
> equation but "hide" parts of them.  White works fine on a white
> background, but...
>
> Off-list CC's appreciated, as I'm on the digest.
>
>
> <http://www.panix.com/~dac/>
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--
========================
Victor Ivrii, Department of Mathematics, University of Toronto
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