Hi all,
this is beahviour described in GM's docs - see
http://www.graphicsmagick.org/Magick++/Image.html#attribute
Retested with libgraphicsmagick++1 (=1.3.25-8) and python-pgmagick
(=0.6.4-1) from Stretch.
> If the named attribute already exists, the provided text is appended
to the existing attribute text.
In this unreleased commit -
http://hg.code.sf.net/p/graphicsmagick/code/rev/c9067f61966c was
implemented functionality required to remove image attributes
> Pass NULL to remove an existing text attribute, or to restart the
text attribute from scratch.
so hopefully will be present in next GM release (after 1.3.25) - all
this applies to the C++ library.
After that maintainer of python-pgmagick should be made aware of this
new functionality (by filling an issue at
https://github.com/hhatto/pgmagick) to make this functionality available
in Python bindings.
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