I'm currently doing analysis on light that enters a water tank. And when I create a linear profile of the water tank, I get a data column with title "luma". What does the program mean by "luma"? Lumens?
Luma is a measure of brightness that comes from the video world. See https://en.wikipedia.org/wiki/Luma_(video). Here's how Tracker calculate Luma (r, g and b are integers in the range 0-255):
public static double getLuma(double r, double g, double b) { // following code based on CCIR 601 specs return 0.299 * r + 0.587 * g + 0.114 * b; }
