Dear all,

Suppose I have drawn a rectangle with its color in dark red, but...
-> how to make the dark red color by 50% lighter?

Thanks for any kind of help!
Rgds,

In the Fill and Stroke dialog, on the Fill tab, select the HSL tab. There 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

Of course the math would be different for different percentage change, but black is always 0 and white is always 255.