Image blending algorithms
I see different math used in different places. For example the
official Adobe reference has the following math for soft-light:
http://postimage.org/image/sna1biopb/,
and there is another different approach in here:
http://www.gegl.org/operations.html#op_gegl:soft-light

I have hard times understanding what is going on and whom to
trust. Can you give me some advice on this one?

Thanks
Image blending algorithms
===

I see different math used in different places. For example the
official Adobe reference has the following math for soft-light:
http://postimage.org/image/sna1biopb/,
and there is another different approach in here:
http://www.gegl.org/operations.html#op_gegl:soft-light

I have hard times understanding what is going on and whom to
trust. Can you give me some advice on this one?

Thanks