Am I colour blind or what? I took a macro of a green cicada. Actually it was light green but clearly green to the eye. On the image it looked a little too yellow so I moved the green slider up. It did almost nothing. To try to work out what was happening, I zeroed all sliders bringing the image to monochrome. I moved the green slider all the way up. There was only a slight increase in a grey/green colour. Zeroing everything again, I brought up the yellow slider and lo and behold, there was the green cicada but still a bit yellow. What is happening here? Why is the green slider so ineffectual and why is the yellow slider so effective in enhancing green?