Find the color temperature of light source with neutral card
Hi all;
I have an adjustable color LED strip that I would get as close as possible to 6700 Kelvin. I hope that I can take pictures of a neutral light card and set the LED color based on temperature/RGB values, I get Lightroom (5.7.1). Is this possible? If anyone can help with the workflow on how to do it?
Thank you very much
I was afraid of that. The numbers only make sense for a radiator of black body like a tungsten light bulb or the Sun, which is a broadband light source. CFLs are generally pretty well made using a series of Phosphors of rare earths that are tuned to human vision and with emissions enough broadband. If you use several sources of monochromatic light as single color LEDs you could not get good numbers. It really depends on the wavelengths of light coming out of the LED. If the color on your camera filters are not the same wavelength of the LED and the sensitivity of three colors of the sensor of the camera is not the same as your eyes, you can get to a situation where your eye perceives neutral colors while the camera sees something completely not neutral. This is from your two raw files. Your illuminated LED Gray card probably looked to the eye, but to the camera, it looked purple. This effect is called Metameric failure and is common if the spectrum of light is very "spicy". This is probably what is happening in your case. You have certainly three narrow band LEDs that you mix. You are really unable to apply the model of the black body of "color temperature" unique to it and then you get strange results you observe. There are index to record high in special colours of the LEDs, which have much wider spectrum light show who have far fewer problems with Metameric failure and that should work for this purpose well.
Tags: Photoshop Lightroom
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