I’d like to use the color ramp as a contrast node (make an input texture’s darkest spot (eg. value: 0.2) output value:0, and the brightest spot (eg. value: 0.6) output value: 1. I thought it was easy, just set the color ramp positions the current darkest and brightest values, then output black and white. Turns out it’s not working for some reason:
On the first shot, the UV/Image editor says the value of a relative dark spot is 0.23, so I set color ramp position to .22. On the other end of the ramp there’s white, so it should output a high contrast black and white image. It turns black.
On the second image it outputs the desired resutls, but color ramp settings are odd (dark spot .05)
Am I not using it right or is it really not working?