print options increase saturation of images

Best way to increase saturation of images printed from LibreOffice.

IMHO, LO is not the ideal tool for picture post-processing. Do that before importing/inserting them in your document.

“Best way” is subjective and a matter of personal preference. Consequently I can’t give you THE solution.

Have a look at specialised applications. The most common tools are GIMP in FOSS world and Photoshop in commercial word, but there are many others.

Some drivers for high-end printers/copiers offer settings for adjusting saturation, gamma and other color parameters (I have seen that for Miko [Konica-Minolta] and a few Canon). It depends on OS and printer.