Vivitar Universal Portable Digital Grey Card Set
$5.95 · eBay
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Arrives Apr 5
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Digital Gray Card Set Premium white balance card set & lanyard Works with any digital camera Perfect for both RAW & Jpeg files Can be used in pre- or post-production Premium lanyard with detachable clip Why use a Gray Card Set? There are sources of light: such as the sun, the moon, artificial lighting, a camera flash, etc. This light strikes an object and it is reflected back to our eyes, which record it and pass it on to the brain, which interprets it for us. An apple looks red, or green, or yellow, because the chemicals in the skin of the apple reflect back these wavelengths. But the true color of an object changes as the subtle color tone of the light that shines upon it changes. The paper looks white to us. It's not really pure white in each of these situations. Our brain knows that this paper should be white so it does some fancy interpolating for us. In reality, the paper in the office probably had a bluish hue to it, as it did in the shade too, and it had a reddish hue in our home, and was maybe slightly yellow in the sun. Our eyes simply adjust and send the right white balance to our brains. Cameras do not have the wonderful flexibility of the human brain. There will be times when an image has a Color Cast to it, maybe a slight magenta, a bit too red, or perhaps yellow. The goal of color balancing is to make the colors right. There are all sorts of complexities that enter into the display or printing of color but the standard that home computers rely upon most is going to be RGB color. With this system there are three primary colors, RED Green Blue. Colors displayed on a monitorare a composite of these three, with each color have a value of Red, Green, Blue between 1 and 255. Pure Black is 0-0-0. Pure white would be 255-255-255. Every other color, all 16,581,375 of them, are a composite of the three primary colors. Sometimes the result can be very good, other times it is way off. It depends on the camera, the way you have it set, the degree to which the light is made up of mixed light sources, and a lot of other things. Getting the proper color balance of an image is probably the most basic step in image editing. But there can be tremendous confusion among digital camera users about how to get a good result. Some software, such as Adobe Photoshop, appears absolutely alien to beginners. It takes a long time, some dedicated study, and lots of experience to really master Photoshop. But the most essential tasks, color balancing and tone control, are really pretty easy in Photoshop and most other image editing programs. Enter THE Gray Card One way to make a photo look right, is to put something in it that has a known value. The software can then correct the color of this one item, pulling everything else in the photo along with it, and making a very nice overall improvement. This willbringithe entire photo towards more realistic color. To use a Gray Card, simply take a picture of it in the same lighting your subject is (or was) in. Use auto white balance and P (Program) mode for the picture. You can either use the resulting picture as the basis for a custom white balance setting, or you can use the Gray Card picture during post processing for a custom white balance. T
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