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Thank you oder auch vielen Dank. What kind of lights do you use? Offtopic first, because that is a damn nice idea: what sensor do you use? What is your experience there? I wanted the thank you for example in your first post. The white point, as desired, occurs between K and K the peak on the left-hand side of the chart. For optimization purposes, I stuck to first dividing the x value the temperature by across each color, followed by an additional subtraction if it led to a significantly better fit.
Here are the resultant charts for each curve, along with the best-fit curve and corresponding R-squared value:. Apologies for the horrifically poor font kerning and hinting in those charts. I love LibreOffice for many things, but its inability to do font aliasing on charts is downright shameful. As you can see, the curves all fit reasonably well, with R-square values above. I could have spent more time really tweaking the curves, but for purposes of photo manipulation these are plenty close enough.
In the pseudocode above, note that Ln means natural logarithm. This function was used to generate the sample output near the start of this article, so I can guarantee that it works. The image below — a promotional poster for the HBO series True Blood — nicely demonstrates the potential of color temperature adjustments.
On the left is the original shot; on the right, a color temperature adjustment using the code above. In one click, a nighttime scene can been recast in daylight.
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