I would say that your only option would be to order the microfilm from the LDS Library in Salt Lake City to your local LDS church org that has a genealogy library. They best copy would be straight from the microfilm. That copy may not be much better than what you have found. However, microfilm printers are greatly improved these days.
"Illinois, County Marriages, 1810-1940,"
Name ...Ace Rowan
Event Type Marriage
Event Date 1818
Event Place White, Illinois, United States
Event Place (Original) Carmi, White, Illinois
Spouse's Name Madcalf
Spouse's Gender Female
Note Marr Date: license only; Pr Name: pg cut off; Sp Name: license only;
Take note that according to this record they got the license only and did not file a marriage taking place.