https://bugs.documentfoundation.org/show_bug.cgi?id=144167

--- Comment #5 from Valerio Messina <[email protected]> ---
If you ever select only dpi or size in mm, you will always get a un-useful
image, because LibreOffice cannot know how many output pixels need in the
vector to raster conversion.
By definition the WxH [pixels] is the results of dpi [pixel/inch] x size
[inch],
so you have to define both, I think this is normal for a vector program.

If you select only the output resolution 300 dpi, with this reference
"test_case", you got an image sized 1210x832 pixels, that at 300 dpi, has a
size of 102x70 mm
If you select only the output size to 320 mm wide, with this reference
"test_case", you got an image sized 1210x832 pixels, that at 300 dpi, has a
size of 102x70 mm

In both case it is wrong, as LibreOffice use the default of 96 dpi (grayed) to
output for a monitor (not a printer) in case of 320 mm wide fixed size, and a
default wide size of 102 mm in case of 300 dpi (printer range) fixed
resolution.

Seems to me that the only working method to export with the wanted pixels size
is to specify both mm size and dpi resolution.
But here export is not perfect and miss the border, so this bug report.

Tested also on LibreOffice 7.2.5.2 do the same

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