Am 03.05.25 um 11:38 schrieb Jürgen Spitzmüller:
Am Samstag, dem 03.05.2025 um 11:22 +0200 schrieb
camus.phili...@free.fr:
I observed that I have to put \DocumentMetadata{} at the beginning of
the tex document (before \documentclass) in order to have
transparency in pstricks pictures.
But I dont know how to put something before \documentclass in my lyx
file !
any idea ?
As of LyX 2.4:

Document > Settings > PDF Properties > Document Metadata

Just insert the content, LyX will wrap it into \DocumentMetadata{}

PSTricks needs only \DocumentMetadata{} which is not possible
with LyX. You need at least one entry, eg.

lang=en

to get  \DocumentMetadata{lang=en} in the document

Herbert
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