Finally LibreOffice image compression did what you expect. Shrink your image or the impress presentation and don’t destroy your pictures.
Old default settings were 90 for JPEG Quality and reduce image resolution to 96 DPI.
New settings are 80 for JPEG Quality and reduce image resolution to 300 DPI. It frustrate me for long time that with 96 DPI all images that will be compressed with LibreOffice are blurred and didn’t fit in any case. After write Bug 128658 and nobody fixed the bug for me, I fixed it myself with 7 lines of code 🙂
The best bug report are the reports you can fix yourself. Be proud of yourself fill bug reports and fix them yourself.