Why EDID is not trustworthy for DPI

[Matyas Selmeci]

Adam Williamson wrote on Tue, Oct 04, 2011 at 07:08:33PM -0700:
> On Tue, 2011-10-04 at 16:24 -0400, Casey Dahlin wrote:
> > On Tue, Oct 04, 2011 at 04:17:08PM -0400, Martin Langhoff wrote:
> > > For fedora users, as others have mentioned, perhaps a UI that lets
> > > users test a couple of possible dpi values might be useful (for those
> > > users so inclined). It does have to cross a good chunk of the stack to
> > > work well, and seems like a lot of work to get right; but the xrandr
> > > improvements are a start.
> 
> > Windows used to have a gui that would show a ruler on your monitor and
> > say "hold a real ruler up to this and slide the slider until its the
> > same size." Given what's been said about how windows handles DPI I can
> > only wonder what it did, but it might be a nice thing to have.
> 
> I think it was more some specific app that did that, wasn't it? I'm
> almost sure it was either Paint Shop Pro or the GIMP, because obviously,
> actual physical accuracy is quite important there. Otherwise it was
> something like Office. It was definitely some specific app where WYSIWYG
> was important, not an OS.

A specific app may have done it as well, but before Vista, the DPI
settings dialog box in the Control Panel had that feature.

-mat