objective c - iOS pictures 1x 2x 3x convert? -

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i coded app, done if go images.xcassets, looks need 1x 2x , 3x pictures. tested app on iphone 6 , runs fine. pictures in 1x boxes.

( universal app ).

i guess if test on iphone 4 now, images big or other way, on ipad images small. think thats why need 1x 2x 3x, right?

could tell me, how 1x pictures converted 2x , 3x?

thanks help

those images different screen dpi. e.g. retina in iphone 4 use 2x images , retina in iphone 6 plus use 3x images, while 1x images used on old non-retina devices ipad 2.

if want use different sized image on iphone 5s , on iphone 6 need provide different asset , set in code.


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