iPad iPad Photos vs. iPhone Photos

Discussion in 'iPad' started by jdecosta, Sep 4, 2014.

  1. jdecosta macrumors member

    Joined:
    Feb 16, 2012
    #1
    I have an iPad Air and a iPhone 5. Both have the same selection of pictures sync'd in iTunes. My iPad Air is showing 17.38 gigs with 5740 pictures. My iPhone 5 has 7.77 gigs and 5740 pictures.

    So here is the question. Why is my iPad showing/using more storage then my iPhone even with the exact same pictures on both devices?
     
  2. Night Spring macrumors G5

    Night Spring

    Joined:
    Jul 17, 2008
    #2
    iTunes compresses pictures when syncing them to iOS devices. It must compress them more when transferring to an iPhone. Which makes sense, because iPhone screen is smaller.
     
  3. BJMRamage macrumors 68020

    BJMRamage

    Joined:
    Oct 2, 2007
    #3
    the above is correct.

    it is based on screen res/size/device for the size of the image.
     
  4. jdecosta thread starter macrumors member

    Joined:
    Feb 16, 2012
    #4
    Thanks for the replies, that what I thought just wanted confirmation.
     
  5. ApfelKuchen macrumors 68030

    Joined:
    Aug 28, 2012
    Location:
    Between the coasts
    #5
    It may be splitting hairs, but data compression is a hot-button issue for me...

    What happens, in my experience, is that iCloud Photo Stream resizes the images, in sizes optimized to the resolution of the device's screen. Increasing "compression" implies returning a lower-quality (more aggressively-processed) JPG, and that, apparently, is not what's happening. (I could test this empirically, but time is short today.)

    While in both cases, data is being thrown out, in resizing the effect is limited to adjoining pixels. In the case of aggressive JPG compression, the effect can range far beyond the immediate region.

    One of the most obvious examples of this is in sunset photos, where aggressive data compression can result in a series of concentric bands, like an archery target - many pixels across a large area are very close in value, so many of them will be averaged to a single value.

    While Apple is not explicit about whether it's resizing or resorting to heavier compression in http://support.apple.com/kb/HT4486 , "device-optimized resolution" strongly implies resizing, rather than greater compression.

     
  6. Night Spring macrumors G5

    Night Spring

    Joined:
    Jul 17, 2008
    #6
    I believe you are right. Now that you brought it up, I remember there have been cases where people reported the storage size for their pictures *increasing* when synced to an iOS device compared to what they had on their computer, presumably because the resizing process resulted in larger file sizes.
     

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