On Fri, Jun 20, 2008 at 7:42 AM, Anne Wilson <cannewilson at googlemail.com> wrote: > I've fixed it by uploading a pdf instead of the original jpg, but I'd dearly > like to know why firefox thought it should be scaled like that. Apparently the justification for this is that it makes Firefox work better on PDAs and other small-screen devices. Firefox3 introduced "automatic image scaling" which IE has had for some years. Here's a post where someone describes his frustration with image scaling in IE7 (at least as far as I know Firefox doesn't get confused by DPI settings): http://weblogs.java.net/blog/chet/archive/2006/10/get_the_artifac.html What annoys me about this in FF3 is that the feature is on by default and the standard preferences dialog doesn't offer a way to disable it. Instead you have to go into about:config as described here: http://www.tipstrs.com/tip/683/Scaling-image-in-Firefox Of course this doesn't help page designers who can't tell whether their visitor's browser has scaling enabled or not.