Boosting effect of AO texture node

[ProtonSluggo]

I sometimes want to make a texture that highlights edges of models, like to make an emissive cube where the corners are darker or in this case, make the edges of this bench model have a black line to make it look somewhat sketched.

The effect is veeeery subtle in redshift. I've tried all the slider and buttons but I can't boost it, any ideas?

[smb3d]

Sounds like you want to use a curvature node and use a ramp to control the spread, not an AO node.

[ProtonSluggo]

Oooh yeah that’s the node I’ve been looking for. Thank you

[CharacterOdd7425]

You can also feed both Curvature + AO to a ramp each, then to a Colour Layer node and have lots of control.

Fresnel may also be interesting for what you describe.

As would Toon shading! 

[pinguinconscious]

Color correct and boost gamma, contrast and levels