Calculating max image size for PNG inside an app?

This should be simple, considering that Apple has published a formula for the max image size that an iPad will display. Here are the details ...
I'm creating a "zoomable" image for use in an app. The PNG is fed into the app via an iframe. It's zoomable because the dimensions stated in the HTML are smaller than the real image dimensions. The person looking at the app uses the "finger spread" method to make the image expand. Sounds odd, but it works. Base image resolution is 264px for retina displays.
Yesterday I tried an image that was 2768 x 4221 pixels and the app simply refused to display it. When I changed it to 1000 x 1525 it displayed fine. Problem is, that should not have worked. Apple says the max pixels for an image on iPad cannot be more than "width x height = 3 x 1024 x 1024" That base formula works out to 3,145,728 pixels. Using Apple's math, my image that displays fine has a total size of 4,575,000.
So I'm confused about how to calculate the correct max image size. Apple's formula looks pretty simple but I apparently broke their rule and got away with it. Help?

Arggg.-
The multiplier "3" is only applied on the "1024 x 1024" side, not also on the side where the developer's image width and height are multiplied.
Arggg Argg ...

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Calculating image sizes for ibookstore submission

I have the new ipad...so all my graphics look great, but I am having a hard time finding the exact method for determining image size for a book I am submitting to ibookstore. Can anyone point me to a way to calculate the best and largest images for ibooks

For all those who are still confused by Apples image restrictions / requirements...
In the new Template chooser after the recent updates is "Antique". This template has a Chapter background image ( the olde world print of sailing ships in blue litho print style ). This print when opened in PS is 2771 x 1506 @72ppi. 2771x1506=4,173,126 pixels.This implies Apple supply a book which does not comply with its own requirements!
Higher image resolution applied to printed photo inmages, make the image sharper. If for example you wanted to print a wall poster 45inches wide, the image needs needs a higher resolution to cater for the size, BUT the same image used for a 45" poster will print 4.5" wide print on your own printer!
iBA full page is deemed to be 1024 x 748. resolution from Apple is 72ppi. An image with those specifications will be OK in iPad & iPad 2 - but not so sharp on a Retina display especially if zoomed larger on screen
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You can change an image in PS i.e. 1024 x 748 and change resolution to 144. PS will double the pixel size as you change the resolution. OK, just change pixel sizes back to 1024 x 748 and reolution is now 144.
That indicates a sharper image which will be suitable for retina display and in fact all current iPad models.
Today my 11th photo book was notified as available in the iBook Store, all my images were pre-formatted at 2048 x 1496 @ 150ppi. ( 2048 x 1496 = 3.063,808 pixels!)
During delivery there were no issues flagged and after delivery no tickets.
So I suggest all those folk pondering images sizes follow my example, which is now proved to be accepatble!
One thing puzzles me though, I dont use all images as full page and they can be masked down to - say - 250 x 200. Should just make an image to fit the size I want to display ??

Recommended Image Size for Contact Pictures?

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I'm not clear on whatyou are not clear on
You simply drag photos to the enpty photo frames in the template - there are move and pan controls if you want to change the position of the photo - you can reight click on a photo and select "fit to frame" in most themse if the photo ratios do not match teh frame ratios and yo are losing parts of the photo
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HT203167 I have purchased Forbes magazine thru zinio app. My money was deducted but I am not getting the magazine for download inside zinio app. How can I get this fixed?

I have purchased Forbes magazine annual subscription
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This forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help with this issue if you ask in the general iTunes forums.
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Please increase max allowed size of PNG image!

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Solved!
Go to Solution.

Laura F. wrote:
I have increased the allowed image size to 1Mb. Please let me know if you experience any issues with this change.
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On this link:
http://helpx.adobe.com/digital-publishing-suite/kb/troubleshoot-content-viewer-digital-pub lishing.html#main_Viewer_appears_to_crash_while_launching__while_updating_library__or_whil e_downloading_folios_on_iPad
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That's an old tech note that should be updated.
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If you're getting the size from Finder, I think Old
Toad's question makes a lot of sense. Is the file
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Image size for ibooks author

Hi
I am making a book using iBooks author. It will be image heavy. (40-50 images)
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This thread is over 12 months old now...perhaps you posted here by mistake. Your problems have slready had rep,ies in another thread, however to answer your question..
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- When life hands you lemons, find someone with a paper cut.
Solved!
Go to Solution.

Hope this helps out with everything.
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Playbookdaily.com
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Calculating max image size for PNG inside an app?

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