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

--- Comment #8 from Jay Philips <philipz85@hotmail.com> ---
(In reply to Regina Henschel from comment #7)
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.

Yes there is a benefit of storing an image version of an svg or 3d model (the
new ones introduced in impress) so other applications can show a preview if it
when its unable to render the svg or 3d model, but in this case i dont think
there is a benefit to storing an image of an image, but thanks for the info. :D

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.

From my searching online, it seems that draw:color-mode has the fixed list of
greyscale, mono, standard, and watermark. And it would be nice to extend this
list to support a few more modes available in MSO including sephia, black/white
25% and black/white 75%.

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.

Yes it would be great to find out if there is already an ODF specification that
we can use to implement the image filter with. According to (
http://blogs.msdn.com/b/brian_jones/archive/2008/03/25/can-i-mention-that-it-s-also-in-odf.aspx
) "... the draw:filter-name attribute can represent the filter name of the
image. This attribute contains the internal filter name that the office
application software used to load the graphic." According to (
https://issues.oasis-open.org/browse/OFFICE-3464 ) "The draw:filter-name
attribute specifies the implementation-dependent filter name that has been used
to load an image into the document.".

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