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You can do it manually using Preview or Photoshop or Pixelmator, etc. and cutting a large image in half so one side goes to each monitor and then select the proper image for each monitor using the Displays preference panel. I finally broke down and paid for the "Multi Monitor Wallpaper" app in the Mac App Store. Another app that will do this is Multiscape. I've tried both and found Multi Monitor Wallpaper a little easier to use.
 
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I have a image that is 625 × 545 ... is there a way I can enlarge it to 2560 × 1024 , so it fits two screens

I gonna check out Multi Monitor Wallpaper.. seems legit .


NVM i try preview and it works . Its so simple ...
 

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