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The bounding box of a preview is determined by the LaTeX package
using the pure TeX bounding boxes. If there is material extending
outside of the TeX box, that material will be missing from the
preview image. For example this happens for the label-showing boxes from
the showkeys
package (which has its own variant in
preview-latex). Should this happen to you, try setting
preview-fast-conversion
to `Off'
(see The Emacs interface).
The conversion will take slightly more time, but instead
use the bounding boxes from the EPS files generated by Dvips.
Dvips generally does not miss things, but it does not understand
PostScript constructs like \resizebox
or \rotate
commands,
so will generate rather wrong boxes for those. Dvips can be helped with
the psfixbb
package option to preview
(see The LaTeX style file),
which will tag the corners of the included TeX box. This will mostly
be convenient for pure PostScript stuff like that created by
PStricks, which Dvips would otherwise reserve no space for.