Another alternative would be to produce the image for a largish resolution (e.g. 1024), set max-width to 1024 and set width to 100%. I believe readability begins to decrease above 1280 - surely there's some research on maximum widths and readability somewhere.
- Chris www.semioticpixels.com ****************************************************** The discussion list for http://webstandardsgroup.org/ See http://webstandardsgroup.org/mail/guidelines.cfm for some hints on posting to the list & getting help ******************************************************