Is it possible to bake the shadows that were the result of a Diffuse Map?
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Hey !
It’s the best answer ever : yes and no 
Eevee doesn’t support baking, so right away it won’t work.
Now you can use Cycles which support baking, but Cycles doesn’t support shader to RGB node
So what you can do is to bake the diffuse with Cycles, and do all the manipulations you do after the shader to rgb either right in a painting app, or in blender’s compositor if you really want the exact same result ( coloramp + mix) , but in the painting app might be simpler …
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I think I found an alternative for the Diffuse BSDF.
Below is the result of the Diffuse BSDF
With this new one, I added a Texture Coordinate, Mapping node, and duplicated the ColorRamp, Color RGB.
It doesn’t have the same result as the Diffuse BSDF result, but I think it’s
enough that it could replace the Diffuse BSDF result, and I can bake it using
an emission and bake to emit.
Hope this information is helpful.
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Hmm… this is not the right way to do this, and it’s only looking “kind of right” through sheer luck. What you want to do is plug your Diffuse BSDF into a Shader to RGB node, then plug that into the Color Ramp
I did plug the Diffuse BSDF into a Shader to RGB node, then plug that into the Color Ramp that resulted in this.
but I ran into a problem where I can’t bake the shadows that has been added by the Diffuse BSDF, So I tried to recreate the result of the Diffuse BSDF, and what I got is this.
I know it’s not the exact same result as the Diffuse BSDF, but with this plug
I can bake the shadows that have been added to the Model.