SUMMARY
This article discusses how to leverage high resolution images on retina displays within Strategy Mobile on iPad and iPhone. The devices which have retina display are:
iPad 3, 4
iPad mini 2, 3
iPad Air, Air 2
iPhone 4/4S, 5/5C/5S
iPhone 6/6+, 6S/6S+, 7/7+
iPod touch (4th/5th gen)
ACTION
When referencing an image which should leverage the retina display, the suffix “@2x” can be used.
Standard:
<ImageName>.<filename_extension>
<ImageName>@2x.<filename_extension>

High resolution: GreenArrow@2x.png

Note: For more information on optimizing for high resolution, refer to Apple's Developer documentation: https://developer.apple.com/library/mac/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Optimizing/Optimizing.html