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Answered

Can I reduce App download size by reducing bit depth of images?

UtamicDev 8 years ago updated 8 years ago 3
Our application (iSew) has a number of applications within it. The download times are too long and I have discovered that a number of background images have 24 bit depth. I have reduced this to 8 bit to make them smaller and they still look fine. The size change (only for about 8 background images) was from 17.5Mb to 5.6Mb!

However, will this change the size of the download?

I am concerned that possibly the images are scaled to a standard bit depth which might mean that there will be no change to the download size.
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This will reduce the time for the initial download of the App from the App Store however you want to test this on both retina and non-retina devices to ensure the images still look okay on all resolutions.
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Also if these images are in In-App purchases, then it will speed up those downloads as well.
Thanks that is a really good answer - straight to the point and highlighting possible issues. We will test it further.
Thanks.