Hi. I am trying to grasp the consepts of histogram, channels, colors (hue, saturation, brightness, luminance) and so on. Why do the histogram show spikes for both blue and green channel when I have screenshotted a red square with the properties as viewed in the screenshot?
1) I would have guessed that it should only show a spike for red.
2) Am I correct that the histogram show the luminance of colors?