https://bugs.freedesktop.org/show_bug.cgi?id=87396

--- Comment #7 from Regina Henschel <[email protected]> ---
Jan Philips: It is possible to store two images for the same object. That is
currently done with svg graphics. The file contains an additional png graphic,
so that other applications, which cannot read svg, can use the png version of
the graphic.

But I'm not sure how to keep the information about the filter. The filter
'watermark' for example is stored in an attribute draw:color-mode. That
attribute has a fixed list of names. The color adjustments like 'red' are
stored in dedicated attributes, 'draw:red' for example.

There exists an attribute draw:filter-name, but I do not know, what the purpose
of that attribute is. The text in ODF part 1, section 19.170 draw:filter-name
is "The draw:filter-name attribute specifies the implementation-dependent
filter name that has been used to load an image into the document." Perhaps
Thorsten knows, whether this is meant to be a graphic filter or a file format
filter. I find no place in LibreOffice where the attribute draw:filter-name is
used.

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