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[Q] SMaL .RAW Color calibration
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=Phili...ra-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. |
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