When a gemstone is photographed with a camera, the body color of the gemstone changes. Different camera settings, photographs taken are also different. Is the color of iridescence, fire, changes of color and other special optical effects captured by the camera complete?
I think it is feasible to evaluate the gemstones' color quality by the images taken with cameras.It is a traditional method，but this way is influenced by its index，it can't restore the color of gemstone completely including changes of color，play of color.But we need camera to record images.
It is reasonable.It is an auxiliary method for color quality evaluation. The camera parameters are set based on the original color of the stone.
I think it is feasible. Adjust the camera's parameters so that the color of the image is as similar to the real object as possible. After that, the camera parameter,object position and captured environment should be kept unchanged during the captured process. We can get the special optical effects, for example iridescence, fire, changes of color. But it is not same with the results by naked eyes. And for the images got by camera, their condition is same. We hope that in the future there will be cameras specifically designed to evaluate the color of gemstones.
I think this is a feasible method at present. Although the camera captures incomplete color, there will be color difference, but through PS and other means, can achieve a better restoration effect. A complete change effect may not be present on a single image at the same time, but it can be evaluated by taking a set of pictures to observe the complete effect. The camera may not be as flexible as the naked eye, but it is more objective than the human eye observation, which is conducive to the establishment of a standard evaluation program.
I think it is feasible to some extent. Depending on the research content, if the research content needs to observe the process of gem color changing with the change of angle, it needs to take a series of continuous photographs to record the change of gem color as completely as possible. If it is only for commercial needs, adjusting the camera's parameters ，choosing the shooting environment, (lighting, color temperature, etc.) to make the color of the image is as similar to the real object as possible , This is conducive to the evaluation of gemstone color quality and price.
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