Hi, this question isn''t about OpenGL, but I don''t know where to ask.. We all know the BlendModes from GraphicProgramms (Darken, Lighten, Luminance, Burn, Exclusion etc) and there''s one Mode Named "Color". Can anyone tell me the formula of this Mode?? How can I calculate the result color of Red and Yellow..? On some pages is writen something like: Color mode: The new HSL values consist of ...hue of the blend image ...saturation of the blend image ...lumniance of the base image But it won''t work.. I ever get a different color as if I use this effekt with PaintShop or PhotoShop... I hope anyone can help me Au''revoir, Aya~