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Asked: 2026-05-31T02:14:23+00:00

I’m currently optimizing my iOS app for the new iPad . Unfortunately by adding

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I’m currently optimizing my iOS app for the new iPad. Unfortunately by adding launch images for the iPad retina display the size of my ipa grows from 1.2MB to 5.5MB, mainly because of the two PNG images in 1536 x 2008 (portrait) and 2048 x 1496 (landscape). The size of these images are respectivly 1.9MB and 1.7MB.

The portrait can be seen here: http://uploads.demaweb.dk/iPadPortrait.png.

As you may notice, the background is a fixed pattern but sadly it seems that this is not very compressible. I’ve further tried to compress the images using ImageOptim, but it does not make any difference after Xcode has compressed the images during the archive. Searching the web I’ve noticed, that some people are dissuading to turn off PNG compressing in Xcode.

Are there anything I can do? It is not a solution to change the pattern in the image to a solid color, as it should look like the background in my iOS view. But it seems odd, that supporting the new iPad increase the size by ~4MB.

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1 Answer

  1. Editorial Team

    Ive struggled with this too, unfortunately not much can be done.

    In an effort to dramatically increase drawing performance of iOS apps,
    Xcode re-compresses PNG files as it builds. It premultiplies the alpha
    channel and byte swaps the red, green and blue channels to be
    sequenced blue, green and red. The result is optimised for iOS’s
    purpose, but as a side effect, ImageOptim’s work gets undone…

    Source

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