RGB Coefficient and Lighting

[nivram]

A nice one. Thanks King_Cool and it is appreciated.

Marv

[Jacob]

Note that i have no deep technical understanding of what goes on behind the sceenes of the Add and Subtract effects, ive just been usning them for quite a while.
If someone else feels the need to shed some light on this, they are welcome to as far as i am conserned.

They are both just blending modes. Add takes the red, green, and blue coefficients of each pixel and adds it to the like coefficients of the pixel behind it. Subtract does the same but subtracts. When you add, everything approaches White which is why light is always Additive. A red square ( 255, 0, 0 ) with Additive Blending enabled overlapping a Green (0, 255, 0) square will result in a Yellow ( 255, 255, 0 ) square produced in the overlapping region.

[King_Cool]

They are both just blending modes. Add takes the red, green, and blue coefficients of each pixel and adds it to the like coefficients of the pixel behind it. Subtract does the same but subtracts. When you add, everything approaches White which is why light is always Additive. A red square ( 255, 0, 0 ) with Additive Blending enabled overlapping a Green (0, 255, 0) square will result in a Yellow ( 255, 255, 0 ) square produced in the overlapping region.

Seriously, its that simple?
The RGB values of each Add-Objects pixel is added together with the RGB of the pixel behind it?
It does appear so.

...Man this doesnt even qualify as voodoo...
What suprises me is that systems which i didnt dare try understand in the past, turn out to be simple and easy to grasp.

Thanks for the excellent and understandable explanation Jacob!