PNG Files?

Discussion in 'iPad 2 Forum' started by Frank77, Jan 12, 2013.

  1. Frank77
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    Frank77 iPF Novice

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    My wife sent me some pics through her iPhone 4S. When I received the pics on my iPad 2, they were all PNG files. When she normally sends me pictures they are in JPEG format. I can still open the files with no problem. Upon investigation, my wife said the only thing she did different was "zoom in” when taking the pics. I thought it was my iPad that was converting the files but, I guess, her phone converts them to PNG when zooming. Perhaps this is the wrong forum to ask, but am I correct?
  2. KevinJS
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    KevinJS Super Moderator Staff Member

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    PNG is an uncompressed image file; JPG is a lossy compressed image file.
  3. twerppoet
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    twerppoet iPad Legend

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    Not quite accurate. PNG. is compresses, but it uses a lossless compression. That means the file is smaller than the actual dippsplayed image, but ther is no degradation of the image. It is a replacement for the older GIF files. Portable Network Graphics - Wikipedia, the free encyclopedia

    JPG by comparison is lossy compression. You can make the files much smaller, but the smaller they get the more degrdation ther is in the image.

    I'm not sure what is going on with the OP's images. Just zooming in with the camera should not change the format. I'll see if I can figure out what's going on tomorrow, if I remember.
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  4. Mickey330
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    Mickey330 Administrator Staff Member

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    The only thing I can think of - did she take a screenshot of the picture that was zoomed in? The iPad, when taking screenshots, makes the picture a PNG file.

    That's the only way I know of to change a JPG file to a PNG file. Well, on the iPad... :)

    Marilyn
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  5. twerppoet
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    twerppoet iPad Legend

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    I did some tests last night, and Marilyn's scenario is the only one I found that resulted in a PNG file.

    I zoomed in with the camera app. jpg
    I cropped in the Photos app. jpg
    I cropped, filtered, and other wise abused a photo in the Flickr app. jpg

    I zoomed into a picture while viewing it in Photos and took a screen shot. png

    All of these I emailed to myself to ensure that Mail itself did not convert anything.


    If you don't know how a screen shot is done, you just press the home and power at the same time, briefly. The resulting picture, in png format, will be saved to the camera roll in the Photos app.
  6. Frank77
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    Frank77 iPF Novice

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    Bingo! After asking my wife if she took a screen shot of the image she said yes.... Thus making it a .png file. Thank you for your replies. Mystery solved!
    Last edited: Jan 13, 2013
  7. twerppoet
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    twerppoet iPad Legend

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    And we didn't even need those meddling kids, or their dog. ;)
  8. Frank77
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    Frank77 iPF Novice

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    Fortunately, the fictional world is a tad more exciting.

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