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Old 10-24-2011, 09:29 AM   #1
twibbs
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Image requirements for Apple Itunes store
I am wondering if anybody has had any idea what the minimum image requirements are for the Apple Store. I have been having some problems getting any clear parameters.
According to the Publisher User Guide:
  • If a cover art file has one of the following problems, it will be removed from sale.
  • ƒƒWrong cover art attached (that is, the title on the cover doesn’t match the metadata)
  • ƒPoor quality cover art (for example, blurry, pixelated, et cetera)
  • ƒCover art is too small (that is., it isn’t a minimum of 600 pixels in the larger dimension)
  • ƒContains advertisements or links to competitor’s sites or competitor’s products
  • ƒMentions included materials that don’t exist in digital product (for example, CD, poster, and so on)
  • ƒUp-selling from the current title to a more complete version of the product
  • ƒContains prices

So it tells us the Cover Image should be min 600px but doesnt say at what resolution - is it 72, 150, 300. I would always have kept the images at their smallest file size t keep the file size down, but these are being rejected by Itunes.

Also what is the correct way to insert/Format an image in to your epub, so that when you tap it on the ipad, it zooms in to larger image?

Look forward to hearing your thoughts/advice
Catherine
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Old 10-24-2011, 09:43 AM   #2
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Quote:
Originally Posted by twibbs View Post
So it tells us the Cover Image should be min 600px but doesnt say at what resolution - is it 72, 150, 300. I would always have kept the images at their smallest file size t keep the file size down, but these are being rejected by Itunes.
File size depends on the pixel resolution, it has nothing to do with DPI.
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Old 10-24-2011, 11:12 AM   #3
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File size depends on the pixel resolution, it has nothing to do with DPI.
+1. DPI is only relevant if you're printing.
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Old 10-24-2011, 11:32 AM   #4
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Quote:
Originally Posted by twibbs View Post

Also what is the correct way to insert/Format an image in to your epub, so that when you tap it on the ipad, it zooms in to larger image?

Look forward to hearing your thoughts/advice
Catherine
I'm not sure you need to do anything special. Every image I've seen in iBooks automatically zooms to fill the screen when you double tap, regardless of where the ePub may have come from.

But Liz Castro has done a lot of research into inserting images into ePubs for iBooks-you might want to check out her blog.
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Old 10-27-2011, 01:16 AM   #5
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I got this email from iTunes last Friday

Spoiler:
Quote:

Image Size
When creating a book, remember that all images must be smaller than 2 million pixels. Since images larger than this reduce iBooks' performance, providing appropriately sized images will help ensure a quality customer experience. Books with images that exceed this limit will soon be removed from the store and a ticket will be created to notify you of the problem. If you receive a notification, simply fix the EPUB and redeliver with iTunes Producer. Note that you can calculate an image's size by multiplying the height (in pixels) by the width (in pixels).

Fixed Layout
When creating a fixed-layout EPUB, make sure the viewport dimensions match the dimensions of the <body> tag. If they do not, the page will size incorrectly and only be partially visible to the reader.
The height and width of a fixed-layout EPUB is defined in a <meta> tag in the <head> section of the XHTML document (for example, <meta name="viewport" content="width=600, height=1000" />). Since iBooks uses these viewport dimensions to determine the aspect ratio, they must be consistent throughout the book (in addition to matching the <body> tag dimensions).


I accidentally placed the print file into an epub (about 5 million pixels) instead of the smaller one. I also had images resizing to 99% in the CSS for that book.

The result in iBooks was that the image would draw on the page and immediately disappear along with the next page.
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