This is a browser-dependent solution, but the site isn’t going to look exactly the same, pixel for pixel in everyone’s browser anyway. I think we’ve all come to accept that now.
https://webmonkey.wired.com/webmonkey/99/45/index0a_page3.html?tw=design
Be careful which fonts you use that you aren’t trampling someone’s copyright.
Also, if you want to just use a certain font for the title effect, I believe there is a plugin for this. . .
https://www.coldforged.org/archives/2004/11/11/image-replacement-for-entry-titles/
Oh, and of course, you would NEVER, EVER post everything as one big image file and [not to put word’s in anyone’s mouth, but…] I don’t think the poster meant that actually. I think he was trying to point out the extreme solution. To be so hell-bent on having one particular font on one’s site for everyone to see — can you imagine the poor peeps on dialup downloading a big honking image of someone’s web page? ??
Anyway I hope these links are of use.