Handling of a large number of images

Hi,
I have 2 iOS apps that have been in the market, 3 years on iPhone, 2 years on iPad HD version. The apps are a popular reference tool in the medical field. They are both comprised of 1100+ images. The current app size is roughly 52mb.
Approximately 400 images will be redone. They are currently jpg and low resolution. The replacements will be png, with higher resolution.
I'm uncertain on pixel size for these images. If they are in the 280x280 range, each file is about 100k, if in the 560x560 range, each file is almost 400k.
So I'd be looking at additional 40mb for the smaller images and 160mb for the larger.
There are plans for another 400+ images in the near future. So, I'm somewhat concerned with final app size.
If I went with the larger size for Retina devices, can I downsize the images for non-Retina devices?
If I supplied both sizes, image.png and [email protected], that would be 200mb just for these images.
I'm a little uncertain on how to manage these with regards to their individual size and, more importantly, their total size.
Any comments or suggestions are welcomed and would be helpful.
TIA,
jb

Suggest you use the iOS Dev Forums...
https://devforums.apple.com/community/ios

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