Shouldn't Normal Blend mode reference both images?

[czerwinskilukasz1]

I noticed that Normal Mode in Blend process just copies the value from Image 1:

ImagePlay/IPL/src/processes/IPLBlendImages.cpp

Line 24 in 371bb20

#define ChannelBlend_Normal(B,L) (B)

Shouldn't it rather be: (A + B) / (FA + FB), where FA, FB are factors (weights) of the images?