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Recommended image specifications. Please help?

919 Views 15 Replies Latest reply: Apr 9, 2013 5:06 PM by vinnyvg RSS
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tndom Level 1 Level 1 (10 points)
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Apr 8, 2013 11:17 AM

Hello all.

 

Could anyone please enlighten me to the best practice image specifications for Multi-Touch books made through iBooks Author? I've looked through the iBookstore Asset Guide and iBooks Author support but can't find anything that specifically applies to .iBooks, just EPUBs. I see that, there, the maximum is 2 million pixels, but does this still apply to .iBooks?

 

The iPad with Retina's resolution is 2048x1536 (over 3 million pixels), so surely it wouldn't make sense to restrict iBook images in such a way?

 

Any knowledge welcome.

  • K T Level 7 Level 7 (23,215 points)
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    Apr 8, 2013 12:02 PM (in response to tndom)

    Don't confuse hardware specs with deployment support.

     

    With any image, ppi/dpi of 72 is sufficient resolution. Anything more is wasted and has nothing do with with H X W.

  • K T Level 7 Level 7 (23,215 points)
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    Apr 8, 2013 12:47 PM (in response to tndom)

    >Would, say, a 100 x 100 image at 72dpi not be of a lesser quality than a 1,000 x 1,000 image at 72dpi?

     

    No.

     

    72 is 72. Try it on your own devices and see.

     

    As a developer (and ebook author), I'm quoting Apple engineers, whom I've come to trust in these things - don't get hung up on the hardware.

     

    >Where and why does the pixel limit come into all of this?

     

    Not sure I understand that question, as 'pixel limit' isn't a technical term I'm aware of, sorry.

     

    Again, do your own testing with your own images on your own devices. Don't let concepts or precepts get in the way of seeing for yourself....works for me.

  • K T Level 7 Level 7 (23,215 points)
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    Apr 8, 2013 12:57 PM (in response to tndom)

    You'd need to ask Apple directly for such clarification on their 'guidance', not me, sorry.

     

    My opinion is that you may be conflating certain info and/or differently interpreting certain parmeters/definitions.

     

    My image editing tools will help/allow me to make any H x W image, 72 dpi/ppi. Suggest you use something that works in that capacity as well.

  • Tom Gewecke Level 9 Level 9 (70,825 points)
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    Apr 8, 2013 1:00 PM (in response to K T)

    K T wrote:

     

    >Where and why does the pixel limit come into all of this?

     

    Not sure I understand that question, as 'pixel limit' isn't a technical term I'm aware of, sorry.

     

     

    Some folks are getting rejections because of the "pixel limit" it seems:

     

    https://discussions.apple.com/message/21724625#21724625

  • K T Level 7 Level 7 (23,215 points)
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    Apr 8, 2013 1:03 PM (in response to Tom Gewecke)

    I can easily image bloated images receiving pushback, with this or that limit quoted to help justify a rejection.

  • AuthorPaige Calculating status...
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    Apr 8, 2013 9:19 PM (in response to tndom)

    I too am confused. If you take the standard cover size the height is 1.5 times the width. If the width is required to be 1400 or larger then the height must be 2100 or larger. This makes the total just under 3 million. What am I missing here? I have tried resizing to everything, either my width is not wide enough or my total exceeds 2 million. I get rejected every time. Does my image need to be rotated sideways or something? I do not understand how to make this cover work in these guidelines.

  • vinnyvg Level 4 Level 4 (1,550 points)
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    Apr 9, 2013 6:14 AM (in response to tndom)

    There is a huge amoount of information relating to  images sizes for use with iBA and iPad display.

    Look at Apples RETINA specs in the store.  here is a copy 2048-by-1536 resolution at 264 pixels per inch.

    (ppi)    to confound you, Apple set a 2 megapixel limit om images  size!  And remember this size related to a fullpage display.

     

    I suggest you search the forum post and read up on the seeming conflicting information.

  • K T Level 7 Level 7 (23,215 points)
  • AuthorPaige Level 1 Level 1 (0 points)
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    Apr 9, 2013 1:27 PM (in response to tndom)

    Yeah. It looks like the cover art you upload separately is only used in the iBookstore. The image you use as cover  art in your actual book is limited to the 2M pixels. I am not sure why they cannot just say that somewhere. Their errors should include that. Lots of people will not know the difference between the cover they use and the cover we use in actual book.

  • K T Level 7 Level 7 (23,215 points)
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    Apr 9, 2013 1:45 PM (in response to AuthorPaige)

    There could be better verbiage, I agree.

     

    In iBooks Author, the first page is captured and used as the 'cover' automatically when using it's Publish to the store menu, then handed off to iTunes Producer, where you can use it as-is, or change to something else if you desire. If you change it, you need to be aware of the specs (see blurb below)

     

    If you create a standard epub, say from Pages, and then use iTunes Producer, adding cover art is manual.

     

    From iTunes Producer:

    iTP_coverBlurb.png

     

    These finer points for covers are covered in multiple areas, ranging from several existing threads here to the blurb to the iTunes Producer Guide to Apple tech notes, and this email from Apple last year which the helpful Apple staffer doubtlessly quoted:

     

    Cover Images

    We are changing the minimum size for cover images. Cover images should now be 1400 pixels wide, in the RGB color space, and delivered as JPEG files. The new minimum size for cover images will be a requirement starting this August. Books already available on the iBookstore do not need to be redelivered.

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