in Ps5, trying to create mist effect - create layer copy,adjust saturation to -100 and lightness to +100, (image turns completely white),select gradient tool, select BandW linear gradient. I drag the pointer from bottom of image to top, but nothing changes - image still completely white, as if the gradient has not been applied. Any help?
Is the Gradient Tool in Normal blending mode?
By the way, you'll have greater control of the mist effect by using a Hue Sat adjustment layer with a gradient mask instead of a completely white layer.