1 2 3 Previous Next 44 Replies Latest reply: Dec 13, 2012 3:19 PM by K T Go to original post
  • 15. Re: Optimized for Retina Display settings?
    limtc Level 1 Level 1 (65 points)

    Not having the new iPad to test, nothing is for sure. But based on how iPhone retina display works...

     

    The iPad will still still have the logical resolution of 1024x768 points. Each point correspond to 4 pixels. So now whatever you specified is based on points - so when you put in a 320x200 pictures, it is possible that iBA is trying to use the 640x400 pictures (just possible, as nobody knows how it works). This is how Safari works in iPhone too - the text is rendered in 4x, pictures are taken in 4x resolutions and display to you.

     

    It is highly possible that anything in photo gallery is automatically in highest resolution.

  • 16. Re: Optimized for Retina Display settings?
    soulhill Level 1 Level 1 (5 points)

    Tim Cook said, during today's event "If your images look good on an iPad 2, they will look even better on a new iPad." I'm inclined to believe him

    You are completely missing the point. A 1024x768 image on the iPad 3 will not look better. A 2048 x 1536 image will. It will be twice as sharp. Your eyes — your 'retina' will not be able to distinguish individual pixels - but only, only, only if the image resolution takes advantage of the screen resolution.

  • 17. Re: Optimized for Retina Display settings?
    limtc Level 1 Level 1 (65 points)

    Developers don't have to recode but still need to give the @2x images.

  • 18. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    You shortchange the technology...

  • 19. Re: Optimized for Retina Display settings?
    Barnheisel Level 2 Level 2 (240 points)

    I don't have the new update so not sure how importing the higher res images works, or authoring for the new ipad etc.

    But I would guess that you would import an 2048 x 1536 image to fill the screen, will test tonight.

     

    Also what happens to a "Retina" ready ibook when viewed on a ipad 2/1?

    Does it save media at 2 resolutions? etc., maybe it does it all on the fly.

  • 20. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    Right - along with Open GL, code, bundle resources, control over shaders, etc. There are many things devs can do directly thru code that book authors are worlds away from

  • 21. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    iOS 5.1...

  • 22. Re: Optimized for Retina Display settings?
    Barnheisel Level 2 Level 2 (240 points)

    I don't have the iOS 5.1 yet

    or the IBA 1.1 (which is suppose to take advantage of the new retina display)

    which is what I was talking about.

     

    will download both tonight.

  • 23. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    All updated here now....5.1 on iPad. 4S & Apple TV. Xcode 4.3.1 w/5.1 support & iPad Retina simulator (huge!)   -  iBA 1.1, iTunes 10.6, GarageBand 6.0.5 and iPhoto 9.2.2

     

    Surprising fast today, given all the updates and all the demand, actually.

  • 24. Re: Optimized for Retina Display settings?
    Barnheisel Level 2 Level 2 (240 points)

    I think I have an answer for you.

     

    I placed a 2048 x 1536 image in a IBA document and scaled it to fit the page.

     

    exported as a .ibook in both IBA 1.0 and IBA 1.1

    then opened the package and looked at the assets.

     

    In version 1.0 the image was replaced with a 1024 x 768 image (half the pixel size of the original)

     

    in version 1.1 the image remained the original 2048 x 1536.

     

    So in version 1.1 the file size was larger (2.6 m vs 1.8 m)

    (the actual jpg was was (123k vs 70k)

    it was 930k before bringing it into IBA (not sure what compression quality IBA is using, but seems like medium #5)

     

    So in the New iPad it is pretty clear it will display at the large size. (264dpi)

     

    the version with the 2048 x 1536 image displayed fine on the ipad2, it must downsize it on the fly.

    There did seem to be a noticeable delay on displaying that page though.

    I will need to test that more.

     

    Hope that helps.

    B

  • 25. Re: Optimized for Retina Display settings?
    soulhill Level 1 Level 1 (5 points)

    Barnheisel,

     

    Now that is a helpful reply! If Apple would document the specifics it would be useful. Right now the "Full Resolution" button considers 1024 x 768 full resolution. I understand that changing this might lead to confusion with present layouts so perhaps a second button would be in order?

  • 26. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    Optimizing performance in your iBooks Author books [ support.apple.com/kb/HT5117 ]

     

    Working with images

    • Use JPG for opaque raster images and PNG for transparent raster images whenever possible.
    • Resize, crop, and rotate images to the desired size and rotation before importing them into iBooks Author.
    • Use an sRGB color profile in your images to improve size and processing time.
    • If you need to use high-resolution images in your book, wait to add them until your book is near completion.
  • 27. Re: Optimized for Retina Display settings?
    Barnheisel Level 2 Level 2 (240 points)

    Where is the "full resolution" button?

    My test were with out changing any settings.

  • 28. Re: Optimized for Retina Display settings?
    soulhill Level 1 Level 1 (5 points)

    KT,

     

    I don't think you understand what this discussion is about. I am asking what the guidelines and best practices are for optimizing graphics for display on the iPad 3, not how to optimize the performance of those books. I know they both have the word "Optimize", but the question is very different. I suspect Barnheisel is onto something — most likely that graphics simply need to be doubled (specifically doubled) in size, but not area. Again, the 'Full Resolution" button on the inspector is misleading in this regard as selecting it would lead to images that display at half the available resolution of an iPad 3.

  • 29. Re: Optimized for Retina Display settings?
    K T Level 7 Level 7 (23,700 points)

    What 'button'? ...we're not seeing it, sorry.

     

    Do you mean 'Original Size'...?