setting up wallpaper for imac dual display

[Yogakun]

Hi,

What time of dimensions wallpaper can I use for my monitors.

imac 2011 21.5 inch, 1920x1080 - 23 inch LED monitor.

 

[btbrossard]

Start out by setting up your wallpaper at 3840 x 1080 (1920 x 2).

Then use Photoshop (or whatever you use for image editing) to split the image in half so you then have two 1920 x 1080 images, one for each monitor.

EDIT: Here's a slightly older walkthrough on dual displays - http://smokingapples.com/opinion/using-dual-displays-on-mac-os-x-the-experience/