Originally Posted by Richard P
Yes that's right. Our eyes perceive an edge as the difference in value between two areas. So a soft edge means the values are close together. Either in the two areas next to each other, or in the transition area between the two areas.
So it would be safe to establish a rule such as :
The harder the edge, the further away on the scale the values are
The softer the edge, the closer together on the scale the values are