CODEWITHSUNDEEP
iosipadsplash-screenios-universal-app
user717452
user717452

Reputation: 111

Large sizes in iOS Universal apps due to a million images

Ok, I have a universal app, which means it has to have an iPhone non-retina launch image, retina image, and iPhone 5+ size retina image. It also has to have non-retina iPad launch for portrait and landscape, retina for portrait and landscape, and then alternate versions as well with slight changes to dimensions. For example, on iPad I have to have a 768 x 1024 and a 768 x 1004. With 8 images required just for the iPad launch image, the file size of my app is huge, as each iPad launch image is between 1.5MB and 5MB. Any suggestions for how I can keep the size down, since it is only high due to large launch images?

Here is what I mean by all the images required for iPad. 8 images???

enter image description here

Upvotes: 1

Views: 305

Answers (1)

David Hoerl
David Hoerl

Reputation: 41642

What you can do to reduce the size greatly is provide jpeg images instead of png. Yeah, I know, Apple asks for png, but you can submit an app with jpg images (I did this for my iPad app).

Use Preview to open the images. save them as JPEGs with a really low quality - or experiment with the quality setting. You will be amazed at how nice a really compressed JPG image can look.

Oh, your launch time might increase by a few milliseconds due to Apple translating the jpg to png during launch.

My experience was submitting when iOS5 was out, so its possible that not using PNG will be a blocker with iOS7. However, I even have a solution if that is needed. Do as I suggest - save the images as highly compressed jpg images first. Then convert THOSE images to pngs - the jpg compression done first should make it easier for png to compress the those images, reducing the size.

There are several PNG "crushers" - programs to reduce PNG size - that work great. Just make sure that you unselect the option to have Xcode "reduce the PNG sizes" - since it actually increases their size!

Upvotes: 2

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