Here is what I have tried: I create a base layer and a blend layer and I choose Luminosity blend mode, so the result suppose to have the hue and Saturation of the blend layer and the Luminosity of the base layer,but here is what I have got instead: base :96 35% 25% blend:283 68% 30% result:96 51% 19% so the result does got the hue of base layer,but the Saturation? not so much. so what is the real color space of this , Now I know is not HSB or HSL and may be is LCH.