Lumix FZ30 RAW Format

Discussion in 'Panasonic Lumix' started by Jay, Jan 19, 2006.

  1. Jay

    Jay Guest

    Hi all,

    Panasonic Lumix FZ30 RAW pics:

    How do I get info on RAW formats so that I can open RAW pics in Paint Shop Pro? Is this documented somewhere in a manual or online? Thanks a lot.

    Jay.
     
    Jay, Jan 19, 2006
    #1
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  2. Jay

    techie Guest

    RAW is a Canon proprietary format.
    Try finding any free software or get one from Canon that allows you open
    and work on the images in RAW fomrat instead.

    Otherwise you woul dlose the benefits with shooting in raw at all.


    The major benefit of using RAW vs. TIFF or JPG is that you could
    practically undo settings on your camera after taking the picture as well.

    Do a quick search on Canon's web site for more details for instance.

    Techie
     
    techie, Jan 19, 2006
    #2
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  3. Jay

    Jay Guest

    Techie,

    Thanks a lot for the info.
    What do you mean by the following:
     
    Jay, Jan 19, 2006
    #3
  4. Jay

    techie Guest


    Let me try to explain this subject by using a bit more laymens terms.
    See I'm new to the RAW format as well so I know what you're going
    through.

    I guess you already know the difference between RGB and CMYK format.
    I'll include this info anyway just to let everyone reading these threads
    see what I mean.

    RGB vs. CMYK ...

    is Red Green Blue, a tripple digit value defining what each saved pixel
    should be in a color value readable to a computer.

    As such R = Red, G = Green, B = Blue so a hexadecimal entry of #0000FF in
    HTML code for instance would represent the value

    Red = 0, Green = 0, Blue = 255

    In CMYK this has to be translated to the equivalent of C = Cyan, M =
    Magenta, Y = Yello and K = Kelvin where Kelvin is the temperature of the
    black color in the image or the contrast/light balance.

    Normally you would use something like 6,300 degrees Kelvin or 4,700.

    This is not so important for the average user, but when you finally see
    your pictures on the computer, you should know that screens sometimes
    default to 6,300 Kelvin and you might have shot the picture at 4,700 so
    it becomes a bit tricky to really tell how the picture will print.

    Even more so importantly, the images clearly print differently if you
    work in Photoshop and save them as CMYK vs. RGB scale.

    Any professional print shop would run your jobs in CMYK and ask that you
    save your files for printing in TIFF at CMYK or as flattend PDF files in
    CMYK format.

    IMAGE SIZE...

    Your image size selector on the camera, lets use something small and
    nifty I used last night. Say the Olympus Micro 4 Mega pixel camera goes
    in the following staffles.

    SHQ 2272x1704 pixels
    HQ 2272x1704 pixels
    SQ1 2048x1538 pixels
    SQ2 640x480, 1024x768, 1280x960, 1600x1200 pixels

    As you can tell the last level, SQ2 is the standard settings for any
    computer monitor of better quality.

    If you shoot at 1024x768 you will get a picture that looks decent on your
    viewer however at a printshop it will for sure come out lousy unless you
    really dont care about it.

    On cameras like this I stick to the SHQ quality setting ending up with a
    picture that is 2.5 Mbyte in size.

    When you look at the picture settings above for RGB you soon understand
    that to store the whole value of this image, you need 2272x1704 pixels
    with three decimal values ranging from 0 to 255.

    This is the JPG way of doing things.

    In TIFF format, it is pretty much the same.

    Now the JPG format is further compressed by various algorithms to achive
    a better file size for the average output format.

    The file may, as in the case of HQ @ 2272x1704 pixels be some 2 MB but
    then you already lost 20% of the image quality vs. the uncompressed, or
    100% JPG format.

    A 100% filesize JPG is still already compressed compared to a TIFF file
    which can be compared to a bitmap layered image where every pixel is
    saved.


    RAW...

    Raw image files save files at a very high resolution. In fact at maximum
    resolution your lens and body can achieve at the specified picture size
    setting.

    Now, to store the complete image value, settings and all, you will also
    have to store the Kelvin temperature value, each layer of C, M & Y values
    and so forth.

    This is where the RAW format achieves it's best and most competitive
    advantage.

    Since you store all of these values, including the settings of the
    camera, a properly created RAW format editor can actually go back and
    adjust every layer, including the temperature values before saving a copy
    of the image to a disk in a 100% JPG format.

    Since you can edit all values, you can also undo certain settings, say if
    you want to adjust the white balance and temp values after you shot it
    and no longer can go back to re-do the photo.

    I hope it didn't get all to technical.

    Take a look at this Flash presentation from Canon and you'll find out why
    I fell in love with the RAW format ability.

    http://web.canon.jp/Imaging/eos1dm2/
     
    techie, Jan 20, 2006
    #4
  5. Jay

    Jay Guest

    Techie,

    Wonderful explanation. I am very much grateful to you for the info.

    PSP-X when opening a RAW file asks the following:

    Width=? Height=?
    Color Channels:
    Single channel (grayscale)
    3 channel (RGB)
    3 channel (CMY)
    4 channel (CMYK)
    File Structure:
    Header size =? (bytes)
    Planar (RRR GGG...)/ Interweaved (RGB RGB...)
    Order: RGB/BGR
    Flipped: (bottom up)/Unflipped

    is this definition universal now, or still we have more RAW types not
    defined here and need more parameters?

    Now, if I can have these info for my RAW files I can open them in PSP-X and
    modify them. All I know is w x h. Is there any way to calculate header size
    (bytes) from w x h and total size of the image file?

    Jay.
     
    Jay, Jan 20, 2006
    #5
  6. Jay

    techie Guest

    I wish I had that program myself to define what can be done and not.
    As I said before, I'm fairly new to the RAW format as well and it depends
    a bit on which camera you use and what software you have I guess.

    As with the Canon, you can set things like location and other
    photographer relevant data to be stored but I would guess this is allowed
    only a certain amount of bytes at the end of the file, which normally
    would be filled with ÿÿÿÿÿÿÿÿÿÿ's or character 255's

    the RAW formats used by Nikon is called NEF, by Minolta is called MRW and
    by Adobe is known as DNG.

    You can find some more links and information under this url
    http://www.cyanwerks.com/file-format-raw.html#rawphoto

    Here is the explanatory from luminous-landscape.com

    http://www.luminous-landscape.com/tutorials/understanding-series/u-raw-
    files.shtml
     
    techie, Jan 20, 2006
    #6
  7. Jay

    Jay Guest

    Techie,

    Excellent information pro. You set me on the right track. Thanks a lot
    again.

    Jay.
     
    Jay, Jan 20, 2006
    #7
  8. Jay

    techie Guest

    No problem Jay.
    Glad I could be of help with my own limited knowledge.

    Techie
     
    techie, Jan 20, 2006
    #8
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