Metafont, the scalable font system for TeX, had per-printer definitions to adjust the font's bitmap rendering for a specific printer. This stackexchange answer

Metafont, the scalable font system for TeX, had per-printer definitions to adjust the font's bitmap rendering for a specific printer. This stackexchange answer briefly describes those parameters: http://tex.stackexchange.com/questions/120414/what-are-gf-and-pk-font-files#answer-120419