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I feel embarrassed asking this,

But I was wondering if there is an easy way to take a specific color  (say red) and make a lighter or darker version of that exact color?

Is there a "scientific" exact way to do this? So that the color in a  piece is all the same red, but just different shades of that exact red?

In the past I've just used the color picker and above or below a particular color but I'm assuming there is a more accurate way.

Hope this makes sense. Thank you