File format for very large images

Discussion in 'Digital Cameras' started by Alfred Molon, Jan 16, 2014.

  1. Alfred Molon

    Alfred Molon Guest

    Since JPEG is limited to 65536 x 65536, which (compressed) file format is
    available for images larger than the JPEG limit?
     
    Alfred Molon, Jan 16, 2014
    #1
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  2. Alfred Molon

    Hactar Guest

    What's the size limit for png?

    :: clickety click ::

    "the width/height of a PNG file is written on 4 bytes"

    so 2^32 pixels (~4 billion) square.
     
    Hactar, Jan 16, 2014
    #2
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  3. Alfred Molon

    Savageduck Guest

    What resolution are you using?
    What are you trying to print?
    What size are you really looking for?
    16-bit or 8-bit?

    A 65536 x 65536 @ 300 ppi is going to extrapolate to a 218.45'' x
    218.45'' image.
    Ridiculous!
    Since that is billboard size, and not likely to be viewed close up, 300
    ppi is over kill. So let's see where 140 ppi gets us.
    That gets us to an insane 468.11'' x 468.11''.

    Why on earth would you need, or even believe you need to go that large?
     
    Savageduck, Jan 16, 2014
    #3
  4. Alfred Molon

    Mayayana Guest

    | What's the size limit for png?

    | "the width/height of a PNG file is written on 4 bytes"
    |
    | so 2^32 pixels (~4 billion) square.
    |

    That would also be the limit on 32-bit OSs for
    handling the data, though. It would be very awkward
    to handle an image over that size. For instance,
    handling pixel data as a bitmap on Windows
    involves 4-byte numbers because that's how
    bitmaps are specified. The width*height must be
    under 4 billion+.

    For the time being it seems unlikely that there
    would be much purpose to a mainstream 64-bit-only
    image file format, since it would require special
    software and special handling on a 32-bit OS.
     
    Mayayana, Jan 16, 2014
    #4
  5. Alfred Molon

    Alfred Molon Guest

    Is PNG compressed or available in a compressed version?
     
    Alfred Molon, Jan 16, 2014
    #5
  6. Alfred Molon

    Alfred Molon Guest

    The other day I stiched a panorama 41000 pixels wide. I might exceed the 65536
    pixels limit sooner or later (not in both dimensions of course).
     
    Alfred Molon, Jan 16, 2014
    #6
  7. Alfred Molon

    Martin Brown Guest

    You might find the following J2k thread helpful wrt very large images on
    64 bit architectures. You could roll your own JPEG32 header that allows
    32 bit image dimensions but it would not be portable.

    https://groups.google.com/forum/#!topic/openjpeg/tcFIcKfGUoI

    J2k gives slightly better quality at a given size anyway.

    Google OpenJPEG Large image sizes should get it if the link is nbg.
     
    Martin Brown, Jan 16, 2014
    #7
  8. Alfred Molon

    Hactar Guest

    Hactar, Jan 16, 2014
    #8
  9. Alfred Molon

    Savageduck Guest

    You have still not told use what ppi resolution you intend to use for
    this massive pano, so the dimensions you are talking about are
    meaningless.
    Are you only going to save for display, or are you thinking of printing
    as some sort of off the wall project?

    How are you planning on printing this monster? Off a wide roll pro
    printer, or as a mounted mosaic?

    Either way I suggest you look into OnOne's Perfect Resize for creating
    that sort of mosaic, or resizing to proportionately match the widest
    roll you have available for the printer you might be using.
     
    Savageduck, Jan 16, 2014
    #9
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