macOS How Do I Screenshot for Mac App Store? Dimensions error.

Hi
I'm just trying to take some screenshots for the Mac App Store for my new app, however I'm having trouble with the size of the image (dimensions). Baically, I can't get a natural screenshot of the app at the dimensions required by the Mac App Store.

iTunes Connect says my screenshot's dimensions must be:

wheras my iMac offers me the screen resolutions of:

None of the dimensions offered by the computer match the dimensions for the app store. I want to take screenshots of the app with the desktop behind, so can't just resize the window of the application.

Also, if I did just want a screenshot of the application, how would I resize the window to be the perfect size for the screenshot?

Thanks,

Sam

KnightWRX said:

Obviously, that's because your iMac has a 16:9 aspect ratio and the App Store wants them in 16:10 aspect ratio.

Set it to a 16:10 aspect ratio and scale them using your favorite image manipulation program. 1920x1200 would be a good choice and downscale to 1280x800 or 1440x900.

Click to expand...

Hi
Ok - sorry if this is obvious, but I have looked and can't find how do set the iMac to this aspect ratio. How do I do it? Not in display section (Mountain Lion).

Sam

KnightWRX said:

You just choose a resolution of the proper aspect ratio. As I told you, 1920x1200 is 16:10. You don't select an aspect ratio.

Click to expand...

Ah ok - thanks - understood and done!