This has been brought up in the past (namely http://www.binaryfortress.com/Forum/index.php?topic=665.0). It looks like the solution to rotating wallpapers to fit a vertically-oriented monitor was to enable the "automatically fix my wallpaper" option, then let DisplayFusion detect when a monitor changes from landscape to portrait and update the wallpaper accordingly. What if one of my monitors is always rotated 90 degrees, and thus never triggers the program to fix the wallpaper's orientation?

More specifically: is there a way to make the same image appear unrotated on my unrotated montior, and rotated 90 degrees on my rotated monitor? Or would I have to resort to making rotated copies of some of my pictures?

Yes, that's exactly what I'm asking about. I have two widescreen monitors: one horizontal and one vertical. Some of my more abstract wallpapers look just as good on either monitor, but having to maintain separate copies of them for each monitor is a bit of a hassle. If there were a way to display some of them rotated, without having to modify the image in any way, it would be pretty handy.

So do you mean for DF (after having checked your resolution and determining that a particular monitor is probably rotated) to then rotate that image when compiling the dual-monitor wallpaper?

I don't know if having it be automatic is the best approach, but yes some option to rotate or flip an image (just like the various scaling and positioning options) would be super.

I have one horizontal and one vertical myself and honestly I just create/find wallpapers that are setup as 1050x1680 rather than trying to flip wallpapers.

Maybe I misunderstood something in this thread, but if not, the solution is rather simple.

I also have (2) 24" widescreen monitors, one permanently vertical & one permanently horizontal. I created 2 folders, one for vertical images & the other folder for horizontal images. Then specify which folder DF uses for each of your monitors in the setup options.

Bingo.

That's exactly what I've done. Works like a charm.

I wanted to pipe in and request support for wallpaper rotation also.

I don't need it automated, I don't have my wallpapers change automatically, but like esbe I find that abstract wallpapers look just as good on their side.

It can be rather difficult to find landscape orientated wallpapers, so rotating an abstract wallpaper is a good option. But I'm kinda lazy and don't want to have to maintain both landscape and portrait copies of a wallpaper