Quote Originally Posted by markbarendt View Post
The point I remember Dunn & Wakefield making was essentially that flare has the effect of extending the toe making it tough to run away from.

The windmill diagrams you provided earlier seem to bear this out too. The +1 diagram shows a more pronounced/longer curve toe in the reproduction quadrant.
This might sound like nitpicking but I believe it presents an important conceptual distinction. Flare doesn't change the film curve. How can it? The illuminance range from the subject striking the film has the lower tones compressed by flare producing the equivalent effect of extending the toe. You can see how that works in Quadrant I, Camera Image / Flare Curve in the examples I attached (which are from a program I wrote).