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Graham Davis
Graham Davis
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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

2076 Views   7 Replies   Latest reply: Johannes Henseler, Apr 15, 2012 5:35 AM
 
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  • Bob Levine
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    1. Bob Levine,
    Apr 14, 2012 5:08 AM   in reply to Graham Davis
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    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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  • Graham Davis
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    2. Graham Davis,
    Apr 14, 2012 6:28 AM   in reply to Bob Levine
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    On the face of it a 2048 folio should be 4 times the size of a 1024 folio, but in my option B it is still the same size as a 1024 folio despite the obvious increase in image quality.

     

    My plan is to use option B for the next issue of Photographer's i Magazine but I am nervous that I may have overlooked something that will smack me in the face later on!

     

    Has anyone else tried similar tests?

     
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  • Bob Levine
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    3. Bob Levine,
    Apr 14, 2012 6:35 AM   in reply to Graham Davis
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    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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  • Graham Davis
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    4. Graham Davis,
    Apr 14, 2012 7:04 AM   in reply to Bob Levine
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    It's for multi-issue renditions Bob

     
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  • Bob Levine
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    5. Bob Levine,
    Apr 14, 2012 8:03 AM   in reply to Graham Davis
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    Carry on.

     

     

     

    Bob

     
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  • Yellow Christian
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    6. Yellow Christian,
    Apr 15, 2012 1:31 AM   in reply to Bob Levine
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    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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  • Johannes Henseler
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    7. Johannes Henseler,
    Apr 15, 2012 5:35 AM   in reply to Yellow Christian
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    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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