Stop using retina-only images

Question

What will happen if I do the following:

• I substitute all non-retina assets with the retina assets
• I delete all retina assets in my project ( All the

Answer 1

3GS and iPhone 4 will both display the image improperly.

The fact is 3GS won't scale down the image. So it won't display the image properly. iPhone 4 will scale the non-@2x image (scale it twice) so it won't display the image properly too.