For 3500K, you will see the line extend from a yellowish hue in the area above the black body curve, while it will transition towards a pink/magenta hue as you move down the same 3500K iso-CCT line below the black body curve. Iso-CCT lines describe points whose CCT value are the same. The color has a close match in the classic RAL colors RAL 7042. In the graphic below, you will find iso-CCT lines for various CCT values. The CIELab color 62.58, -1.51, -0.21 is a light color, and the websafe version is hex 999999. If you've successfully grasped the concept behind color temperature correlation, you should now understand why not all light sources with the same CCTs will necessarily have the same color.
#Black light color converter how to#
Read more about why CCT is insufficient for film & photography lighting applications, as well as how to translate Duv values to green gel values. RGB color mode is a color standard in industry, which is used to obtain various colors by changing the three color channels of red (R), green (G) and blue (B) and superimposing them on each other. If using CCT and you are concerned about light quality, it is always best to also include information about the light source's Duv value, as it includes information about the distance and direction away from the black body curve. It's important to note that in correlating a light source's measured CIE xy coordinate value to a color temperature value, we immediately lose information about the magnitude and direction of this correlation. But if the deviation is so large that the light source is no longer considered "white," the result is likely to be not meaningful. The word "correlated" in "correlated color temperature" (CCT) refers to the mathematical process that answers the question above.īut what if the deviations are not minor? Mathematically, the process of correlating to a color temperature value is still possible, and the formula (including our calculator) will produce a numerical result. When these deviations are minor, it can still be helpful to ask, "what is the color temperature value of the closest point along the black body curve?" - because it allows us to make simple, intuitive judgement about the color of a light source. Instead, we see minor deviations from the black body curve due to atmospheric absorption (natural daylight) and manufacturing variability (artificial lamps). But most light sources, including natural daylight, do not actually exhibit light color that is exactly on the black body curve. As the color temperature value increases, we move further down the curve (down and left, towards the blue region). Mathematically, however, it is possible to calculate a CCT value for light sources that are not even close to being white - for example, a saturated green LED from an RGB system can have a calculated CCT of approximately 7000K, even though its qualitative color appearance is vastly different from a white LED at 7000K.Ĭolor temperature is an absolute, one-dimensional metric that describes a particular point along the black body curve. Use caution when "correlating" color temperatureĬolor temperature is a useful metric when discussing approximately white color light sources only.
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