Photoshop Lightness Regulation Formula

l is the current lightness.x is the offset that will be regulated.L is the new lightness after regulation.Two formulas are equal to each other.

L(l,x)=l+(1l)x,l+lx,x0x<0{1x1}

L(l,x)=x+|x|2+l(1|x|){1x1}

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