File names for various digital cameras and RAW extensions

Discussion in 'UK Photography' started by aniramca, Oct 23, 2007.

  1. aniramca

    aniramca Guest

    Two questions about recorded digital photo files:
    1. Filename for photos : Canon with IMGxxx, Panasonic with Pxxx, Casio
    with CIMGxxx, Sony with DSCxxx. What about others such as Pentax,
    Nikon, Kodak, Olympus, Fuji, etc. ?
    Could this name be changed prior to picture taken? or is this feature
    built-in the camera that the photos will always have that file name,
    plus the numbers that follow?
    2. Why there are so many file extension for the RAW files? I heard
    different extension name for different brand camera, and even
    different name for same camera with different model. Example : Nikon
    with .NEF extension. With this different extension name, does this
    mean that the data must be read by a special softwares (as the one
    that comes with the camera or special PSP or Photoshop) ? What
    happens if you rename the file extension on purpose, can it be read by
    PSP or photoshop? or it will become corrupt? Is there a common file
    extension name, such as .RAW?
    Thanks for info.
    aniramca, Oct 23, 2007
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  2. aniramca

    ray Guest

    My kodak P850 produces 100_nnnn.kdc for raw - nnnn represents a serial
    Don't know about MS - but *nix could not care less what the extension is -
    it looks at the contents of the file - you can name it whatever you want.
    ray, Oct 23, 2007
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  3. There is no "RAW" format, as such. Each manufacturer
    uses their own format, and chooses their own "standard"
    for naming files too. Note that there is no direct
    connection between the file name and the file format
    either! Nikon, as one example, uses the same ".nef"
    extension for several file formats, all of which are
    very similar but different in some ways.

    The actual distinctions between file formats are
    embedded in the files, not the name. For major
    differences, for example to indicate that a file is from
    Canon, Pentax, Nikon, or whatever, the first few bytes
    of the file are an indicator. That is referred to as a
    "magic number", and is true of most unique file formats
    (JPEG, .exe, TIFF, .dvi, .gz and so on all start with a
    "magic number" to identify them uniquely).

    Hence even if a file is renamed, virtually any software
    that is designed to work with that type of file will
    still be able to use it.
    Floyd L. Davidson, Oct 23, 2007
  4. aniramca

    Alex Monro Guest

    Fuji use filenames of the form "dscfnnnn", where the nnnn is a sequence
    number. Some Olympus cameras use "pMMDDNNNN", where MM is the month, DD
    the day of the month, and NNNN is a sequence number. I've seen some
    cheap "no-name" cameras that seem to use "IMGnnnnn".
    I think there are some cameras which allow a user settable prefix in the
    filename, but this isn't common.
    Alex Monro, Oct 23, 2007
  5. aniramca

    Trev Guest

    There is a .raw but its not a camera raw format and existed long before
    digital cameras.
    Trev, Oct 23, 2007
  6. aniramca

    John Bean Guest

    Wrong, it *might* be. Panasonic cameras use .raw as a file
    extension for their camera raw files.
    Yes, it did. It's never wise to trust a file extension to
    identify a file type without checking the contents.
    John Bean, Oct 23, 2007
  7. fup2

    Floyd L. Davidson:
    "Uniquely" -> in theory. To make things more complicated, some formats
    get reused. As an example, Nikon's NEF (at least the variant I got) is
    in fact a TIFF file with some private tags. When you open a 20 MB NEF
    file with a regular image viewer that ignores file extensions (as it
    should) and doesn't know about NEF (like ACDSee 3), all that is
    displayed is the tiny RGB preview image.

    However, people handling Nikon RAW files usually know what to do with
    them anyway, so I wouldn't consider that a huge problem. If the file
    extensions get lost and the person responsible for handling the files
    doesn't know about their origin, it might become a problem, though.
    Marco Schmidt, Oct 25, 2007
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