iphone - Reducing iOS app size - Are <imagename>@2x.png images redundant? -

i trying reduce size (30+ mb) of binary submission, , sense images acquire sizable (>26 mb) part.

i observed if remove retina images (@2x.png), ios gracefully replaces them 4-inch retina (-568h@2x.png) versions.

are retina images redundant if supply -568h@2x.png versions?

p.s.

not 1 image makes of difference, if answer yes, apply default.png?

in general image@2x can used stand in image, not other way around (because wouldn't good). side effect of doing more memory used , on non-retina devices cause problem. if aren't supporting non-retina devices don't need images.

generally speaking shouldn't have many image-568h@2x images other default , other background images. of content images same size no matter screen size is. not need differently named images button of same size on multiple different screen sizes.