On 16.03.2012 18:41, Zdenek Wagner wrote:
snip
There are two separate problems:
1. Prepare an image with transparency. You must use a format supporting it
Can probably be done with ImageMagick via console and thus should be
available via \write18 (or that stuff). See:
http://www.imagemagick.org/Usage/masking/
2. Include the picture an a way preserving transparency. When doing
this you must ensure that you create a PDF with a minor version
supporting transparency. If the version does not support transparency,
then it is an expected behaviour that xdvipdfmx will remove it.
Remember that transparency is explicitely prohibited in PDF/X and
PDF/A. I do not know the first version of PDF supporting transparency
Default of xdvipdfmx is 1.4 but can be changed by -V.
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