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Best ID doc size for iPad 3 retina display but works also for iPad 1 & 2

Apr 14, 2012 4:27 AM

iPad-3-Resolution-Test.png

 

I have done some iPad 3 tests using PDF image format:

Using the same hi res source files in ID

 

A::ID 1024 doc size: Folio Builder exports 1024 folio (1mb)

B::ID 1024 doc size: Folio Builder exports 2048 folio (1mb)

C::ID 2048 doc size: Folio Builder exports 2048 folio (4mb)

 

At max zoom on iPad 3 A is inferior quality but B and C are the same but C is 4mb

 

Clearly B is the most practical option but  I don't understand why B is not 4mb as the source files are hi res and the folio is being upscaled by Folio Builder?

 

Can anyone explain this?

 

The image above is 1000 px taken from 3 screen grabs from 3 folios each at max zoom but is reduced here because of blog limitation

 
Replies
  • Currently Being Moderated
    Apr 14, 2012 5:08 AM   in reply to Graham Davis

    PDF has built in compression algorithms that I wouldn't even attempt to understand. I'm sure someone could give you the techical aspect of it.

     

    Bob

     
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    Apr 14, 2012 6:35 AM   in reply to Graham Davis

    Is this for a rendition or for a single edition? I wouldn’t do that for a singled edition without testing very carefully on an iPad1 and 2.

     

     

     

    Bob

     
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    Apr 14, 2012 8:03 AM   in reply to Graham Davis

    Carry on.

     

     

     

    Bob

     
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    Apr 15, 2012 1:31 AM   in reply to Bob Levine

    Like your self Graham I shall be looking to publish a HD rendition of Guitarist Deluxe next. But I am nervous, like your great magazine, we are rather weighty with the last issue notching up to 467mb. Ok, I can say one quarter is video and the majority of articles are either smooth scrolling or horizontal swipe only but a PDF version of the latest folio cut the jpg folio down only by 10mb weighing just 457mb.

    I can't help wondering if we are missing something. Have you experienced the April edition of fast company? SD rendition was 48 mb and HD rendition just 89mb. That's an incredible piece of production as the mag is (all be it only portrait) huge with smooth scrolling all over the place?

     
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    Apr 15, 2012 5:35 AM   in reply to Yellow Christian

    I just looked into the fast company app and they use PDF articles where

    possible and all the smooth scrolling articles are PNG. don't know how they

    get that low file size. maybe the layout is good for compression in PNG,

    because it only contains clear colors, illustrations and whitespace (not so

    much images).

     

    —Johannes

     
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