Welcome to the community here
LaPierre!
I'm a little confused (so what else is new) 'cause you say that you want to convert the tiffs to either gif, jpeg or png for web purposes. But then you say that they "print out" fuzzy.
[confused] Are you actually looking to convert your existing files to a format suitable for
both web & print purposes? [confused]
Can you post (perhaps via a weblink) an original tiff to see what we're up against, along with the web dimension specs?
Offhand, I tend to agree with Mark... and without even knowing the size of your original tiff files, I really can't foresee "line drawings" scaling down crisply (for web purposes) without losing a lot of data... let alone for 'print purposes'.
More info, clarification, please!