From Kb_JMY(晉明夷)

Inkscape: Colour Management

faq

How to make a certain color 50% lighter?

• Ref:

1. inkscapeforum.com -- How to make a certain color 50% lighter?

• Ans: In the Fill and Stroke dialog,

-> on the Fill tab, select the HSL tab.

-> look at the L slider. You could either visually slide it halfway to the white side,

-> or use the number beside it and do some math. Black is 0, white is 255. So if the number is 50 for example, you would do this -- ((255-50)/2)+50