2048x1496 exceeds the limit of 2000000 pixels per image.
We recommend providing images that are at least 1.5 times the intended viewing size up to a maximum
of 2 million pixels (image height multiplied by image width should be less than 2,000,000px). Two million
pixels is the largest image size allowed. For example, a single-page, full-bleed image should be around
1200px by 1600px.
Elain you can use image editing software to batch resize and reduce quality (size) of your jpegs. Which image editing software do you usually use?
Not sure if I am rocking the boat.. this is from Apple support page re Image Gallery
When you publish or export your book, images are automatically scaled down to a width of 2048 pixels for viewing books on an iPad with a Retina display. These images can be viewed on an iPad without a Retina display (iPad and iPad 2), but may result in degraded performance while viewing the book. You can improve viewing performance on an iPad without a Retina display by using images no wider than 1024 pixels.
This should access the full article: http://support.apple.com/kb/PH2790
Are images used to create a gallery processes diffently than inserted photo images to a book page??
I guess they are different. I code by hand and have never used iBooks Author so I'm not familiar with how it should be used, but if you're using it you should follow whatever guidelines are set for it, if you're using Gallery and you care for older devices scale the images down. Nothing beats a real device test though, so build the book, upload to a device and check and see maybe it works with large images just as well.
But I don't think it applies to other workflows, Elain didn't mention iBooks author so I'm assuming she isn't using it.
Hoping this question adds to the value of the thread. I'm creating a fixed placement iBook using HTML and images, not iBok Author. I was relying on Lynda.com and then realized they offer no direct support for their training content. I just want to know, for a children's book that is viewed in landscape, what my total image dimensions should be for best performance on retina and older. I'm nearly 30 pages through a 44 page book and I've created landscape full-spread images to be 1120 x 720. That translates into two pages by the way.
When I view this on iPad with retina display it looks great, but when I double click it's not too great.
Quesiton: WHat in the world is the right dimension. I see advice all over the map.
Charts "Layout sizes for iBooks Author":
This is a part of my upcoming book "iBookstore nuances."
You can see some examples of my calendars "2013 calendar ..." in iBookstore.
Apple state what image sizes are accepatable using iBA. They say that any image over 2megapixels will be rejected. In truth I have had some leeway on that.
I imagine that however you make your book, the content needs to comply with the standards set for iBA. IF you intend to submit to the iBookstore.
Images sizes are best taken to be suitable for Retina display and ignore any other options.
2048 x 1536 Res 264, or.... 2048 x 1496 Res 264
This is landscape, swap around to suit Portrait. Just remember to set the resolution first if you are re-sizing.
Once you have your images fornatted to those sizes, you can fix the size on the page as you want it.
Edit: Any critics should know this is how I have added images to ten photo books which have gone into the store in the past 3 weeks.... without tickets !
All dimensions and resolution (full pages) of my charts = 2048 x 1496 pixels.
2048 x 1496 pixels = 197.0 x 143.9 mm, 264 ppi
2048 x 1496 pixels = 256.3 x 187.2 mm, 203 ppi
2948 x 1496 pixels = 361.2 x 263.9 mm, 144 ppi
You can rename any file *.Ibooks to *. zip and look, what in there with sizes and resolutions of images.
Thanks to both of you for the detailed help. So simply put if I wanted to I could create full-spread images at 2048 x 1496 at 264 ppi, then split them in half to create the individual pages (left and right) and use CSS to place the fixed HTML text. Is that accurate?
BTW at 1120 x 720 spread and 560 x 720 single page (300 ppi), the book actually looks great in iBook Proofer. It's just if someone really wantedt to zoom in that it gets a bit funky, but from a purely functional standpoint it looks great, especially with the rendered HTML text. Trying to decide if it's worth it to go back in and format to higher res (I can based on source artwork but it would take some time).
PS: Is Book Proofer supposed to show the full book, or just the first 8 pages or so? Mine doesn't render the entire book.