Free Utility That Displays RAW Pixels?

Discussion in 'Digital Cameras' started by jim evans, Aug 15, 2007.

  1. jim evans

    jim evans Guest

    Anybody know of a free Windows utility that shows the raw pixels of a
    RAW image? The individual pixels are all grayscale before the Bayer
    conversion. I'm giving a talk and would like to be able to show these
    gray pixels and also show them in the red, green and blue colors each
    pixel represents. The utility would take a small area of a RAW image
    and show the pattern of gray dots and also convert them to the color
    they represent before Bayer conversion.
     
    jim evans, Aug 15, 2007
    #1
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  2. jim evans

    jim evans Guest

    Thanks. It looks like IRIS is doing what I want. I got the
    grayscale, but haven't figured out how to get the respective RGB
    pixels. I figure that will come. Somehow it shows combinations of RG
    GB RB instead of the basic Rs, Gs and Bs
     
    jim evans, Aug 15, 2007
    #2
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  3. jim evans

    John Sheehy Guest

    I don't think IRIS has any way to color the pixels according to their
    filters. You have to load the image into photoshop and color them.

    If you use IRIS to interpolate color, the options have to be set to the
    correct camera, or one that has the same CFA pattern. Most cameras will
    have a cyanish-green cast when the correct CFA pattern is used for color
    interpolation (which is the natural response of most digitals).


    --
     
    John Sheehy, Aug 16, 2007
    #3
  4. jim evans

    Ray Paseur Guest

    Jim: Look for the feature called a "channel splitter" in the program. A
    google search is not very helpful, but if you have an image processing
    program the channel splitter usually gives you a way to isolate each of the
    three RGB channels. ~Ray
     
    Ray Paseur, Aug 16, 2007
    #4
  5. [A complimentary Cc of this posting was sent to
    Floyd L. Davidson
    Right.

    The complicated solution is to use -fx of ImageMagick.

    The simplest solution is to (optionally) convert grayscale to RGB,
    output as .txt format via ImageMagick, run a simple
    Perl/TCL/Python/etc script to edit the resulting .txt file, then
    convert back to "more conventional" image representations via
    ImageMagick again.

    Hope this helps,
    Ilya

    P.S. Conversion to RGB is useful so that the format of .txt file does
    not need to be changed, only the appropriate 2 numbers of 3 in a raw
    need to be zeroed...
     
    Ilya Zakharevich, Aug 18, 2007
    #5
  6. [A complimentary Cc of this posting was sent to
    Floyd L. Davidson
    [about 50-lines-long script deleted]

    This is why I said to use an appropriate tool. In Perl, it would be a
    2-line script. [Slightly more if one adds help and includes calls to
    imagemagick inside the script - but I would leave it out.]

    Hope this helps,
    Ilya
     
    Ilya Zakharevich, Aug 19, 2007
    #6
  7. [A complimentary Cc of this posting was sent to
    Floyd L. Davidson
    google for it.

    Hope this helps,
    Ilya
     
    Ilya Zakharevich, Aug 19, 2007
    #7
  8. [A complimentary Cc of this posting was NOT [per weedlist] sent to
    Floyd L. Davidson
    Having some minimal clue when googling helps a lot. Unfortunately,
    google decided to keep casual user clueless...

    Google ==> Advanced ==> Help

    I used

    imagemagick fx

    Hope this helps,
    Ilya
     
    Ilya Zakharevich, Aug 19, 2007
    #8
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