On Fri, Mar 16, 2012 at 05:41:45PM +0100, Zdenek Wagner wrote: > Image inclusion in pdftex can be achieved by pdftex primitives (if I > remember it well, by \pdfximage etc). LaTeX packages do nothing but > provide macros calling these primitives.
There aren't primitives for transparency. Transparency is achieved by using low level primitives (\pdfliteral or \pdfcolorstack* and \pdfpageresources) that define the needed PDF constructs according to the PDF specification. It's more complicate than applying color, because the transparency values have to be stored in a dictionary in the page resources. Colors don't need this. Examples: * pdftransparent (also an example for \pdfcolorstack) * pgf > It is not difficult to find > their description. the note concerning the PDF version still applies, > transparency will be removed if the minor version is not high enough. > The difference is that the minor version can be both queried and set > via \pdfminorversion and most probably the default is set so that the > transparency is supported. Transparency was introduced in PDF 1.4. However the TeX engines don't check whether a user/package uses features higher than the version number would support. pdfTeX only warns or throws an error message, if the feature in question is in control of the engine. Example: \pdfobjcompresslevel. Yours sincerely Heiko Oberdiek -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
