Which ppi is correct in iOS4 images (normal and high res)

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Which ppi is correct in iOS4 images (normal and high res)

Hi to everybody,

I want to add high res images in my iOS4 app. I already read this http://developer.apple.com/iphone/library/documentation/iphone/conceptual/iphoneosprogrammingguide/SupportingResolutionIndependence/SupportingResolutionIndependence.html#//apple_ref/doc/uid/TP40007072-CH10-SW2 and a lot of other pages but I did not find the answer which ppi my image should have.

Currently, I have an image for example button.png with 160ppi and 50x30px. Now I want to create a high res image named [email protected]. Is it correct to use 326ppi and 100x60px?

I already had a look at other iOS open source apps but each app did it on a different way. Most apps used 72ppi for normal and high res. What is correct?

Thanks for your answers

Walter

+4 A:

To be quite frank, I've not found a need to adjust pixel resolution for my images (i.e. I leave my Photoshop templates at 72 ppi and they're OK). If you just provide the correct dimensions for each format, the system will know how to deal with your images appropriately depending on the resolution of the device it's on.

BoltClock 2010-09-07 20:12:43

+1. It doesn't matter what you put in there. 72 is a good standard that works well in almost every situation.

Eiko 2010-09-07 20:16:48

As you say, PPI is irrelevant - it's only ever a hint for anything that would use the image where real measurements mattered.

Kendall Helmstetter Gelner 2010-09-07 20:44:33

thank you so much. Walter

Walter Bot 2010-09-07 21:31:48

@Walter: glad to be of help. Be sure to click the green tick next to an answer to indicate that it's the best answer.

BoltClock 2010-09-07 21:35:29

ansaurus

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Which ppi is correct in iOS4 images (normal and high res)

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