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Known issue as in  tdf#88675
<>    and here is
the answer I provided on the SE SuperUser  question

"This is a known issue in LibreOffice (tdf#86675) where PNG images being
imported/inserted and scaled are using "Nearest neighbor" in rendering the
document canvas, rather than more common Bilinear, or BiCubic (Catmull-Rom)
pixel interpretation on scaling. Also, for now in LibreOffice, believe PNGs
with Alpha channel are always "scaled" using nearest neighbor.

Especially an issue on Linux builds, less so on Windows builds.

So, if you can prepare your PNG to the exact size needed, as well as prepare
or convert to a non-Alpha channel PNG (using ImageMagick's "convert
input.png -background white -alpha remove output.png" or similar utility),
you should be able to have acceptable image insertion and rendering in a
LibreOffice document.

See: "

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