Tracker software has a tool called Line Profile that allows users to measure the bright intensity of the pixels’ colors of the image along a straight line, with length defined by the user. One can increase the line width by changing the spread value; image pixels above and below the line are averaged in order to reduce noise and/or increase sensitivity. So we can detect the maximum and minimum intensities of light along a line in an image and measure the distance between them in pixels, or after calibration in meters. This means that we can use this tool to identify the peaks of intensity of each color line in a light spectrum, with more accuracy than the human eye!