Adding Alpha Transparency to an Existing Color Value

The relative color syntax can be used to change the lightness of colors. For example, LCH open up parentheses from space red space Calc L minus 20% space C space H. This creates a new dark red color by setting lightness to 20%. It's not a calculation. It's just a reassignment,. which is what makes this an absolute change to the color and not a relative one. And let's do an RGB example, since we've been working on C H, say you want to do RGB, you would have RGB and then in parentheses fromspace red, that's the color that you're working in. Then you would specify RGB with spaces in between, and