Quote - original image plugged into a subtract node then a bias node which is plugged into the blendin value. original image plugged into input #2 of the blender node with skin plugged into input #1 of the blender node.

So you're trying to make brighter areas just go white? You don't have a separate mask?

You didn't say any numbers, so I have to say again - numbers matter.

If you're taking the color - x, then the value of that is far less than 1, but I can't tell you exactly what you did wrong or should do if I don't know x.

The bias node can increase or decrease a number, so again since you didn't show or describe the numbers, I don't know what goal you're attempting to achieve with the bias.

You're trying to plug that in as the blending factor, but it never is 100% because you made a number that is much less than 1.

Using 100 * (color - x) as the blending factor will produce a far different outcome.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)