Shader Brick Color Limits

Dimension-Z

Hi everyone

I'm trying to build a custom shader and want to add a color parameter with user limits.

Is it possible like in the example:

 

Thnx in advance

D-Z

Eustace Scrubb

I could come up with certain constraints you might use internally that would prevent the final color from falling outside particular ranges, but I don't know how to constrain the input color value itself, directly.