[Q] SMaL .RAW Color calibration

Discussion in 'Digital Point & Shoot Camera' started by David Phillip Oster, Dec 18, 2006.

  1. I bought a Philips 3MP Retro Style Ultra-thin pocketsize camera, PT4434
    because I needed a thin camera to keep in my shirt pocket. Walmart has
    them for sale cheap.

    http://www.google.com/search?q=Philips 3MP Retro Style Ultra-Thin Camera

    Unfortunately, it doesn't do .jpg encoding on the camera, instead, it
    saves the images in .RAW format. The variant of .RAW it uses appears to
    be SMaL.

    The camera comes with Windows software to decode the images, but I only
    use Mac OS X.

    I found some open-source software software that decodes the .RAW to
    ..TIFF,

    Dave Coffin's dcraw at http://cybercom.net/~dcoffin/dcraw/

    The source code compiles ad runs with not problem on OS X, and it works
    great. The above URL links to pre-compiled version for OS X.

    However, the resulting .TIFs have rather weak reds. Currently, I fix
    this using Photoshop's "Levels" dialog:

    I photographed a neutral gray image, blurred it so all the pixels were
    roughly the same gray level, brought it up in "Levels", and clicked on
    the middle "gray" eyedropper icon. Photoshop corrected the image to
    neutral gray. I pressed the "Save" button on the "Levels" dialog to save
    that correction as a named file.

    Then, for my other photos, I applied that same correction. ("Levels"
    (Load), saved as an automation.)

    The pictures done this way are OK, but I'd like to do better.

    Do you have any tips generally on color correcting .RAW images from
    cheap point and shoot digital cameras?

    I'm tempted to print a color swatch card, photograph it with a borrowed
    camera, photograph it with the Philips, write a program to compute the
    best levels curve to transform the Philips image to be as close as
    possible to the reference image, and edit dcraw to apply that levels
    correction to all the pixels before it writes its TIFF.
     
    David Phillip Oster, Dec 18, 2006
    #1
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