Histogram in CS4 - ! symbol

[PeterAit]

Sometimes the histogram in CS4 displays a ! inside a triangle. Clicking this changes the histogram slightly and makes the symbol vanish. What exactly is this doing?

Thanks,

Peter

[digitaldog]

Sometimes the histogram in CS4 displays a ! inside a triangle. Clicking this changes the histogram slightly and makes the symbol vanish. What exactly is this doing?

Updating a more "accurate" histogram which is a cached representation before doing so for speed issues. If the Absolute accuracy of the graph is super important to you, click on the triangle.