Still, at the lowest level of logical order, the semantics of white space is not stored for the difference between space, tab, kern and the difference between soft hyphen and hard hyphen, even for English. Inference from glyph identifiers for UCS/Unicode and from spatial information for logical order works best if the script is simple and the layout is single column. Various stuff lost and misformatted however. > PS I also have some multipage pdf's where I was able to do select all from preview (set to text) and contrary to my expectation copy/paste into Pages to create a multipage doc. What some application software does is assume semantic information from spatial information, as in OS X 10.6 that introduced the assumption that a certain amount of spatial distance is probably a column difference. If the spatial information at the Page Description Language (PDL) level is mapped to semantic information at the Standard Generalised Markup Language (SGML) level then the PDL is accessible, and reflowable.

But that is the one and only capability that comes automatically, that is, structure in the sense of page bounding.Īnything above the basics of a customisable graphic co-ordinate geometry (a 'page') and the identifiers for the graphic objects imported into the geometry has to be added by the user who tags / marks up the geometry information with ICC colourimetry information and, for the purpose of the present problem, with UCS/Unicode character information and content information on the mapping of the layout rendering order to the logical reading order. PDF is page-independent, so pages may be manipulated singly (not possible in PostScript).

Multipage pdf to jpg mac os x