filterCurve Method Deteriorates Image

[sarpdoruk]

I have tried to change RGB curves of an image but there seems to be a problem with "filterCurve" method. What it does is deteriorating shiny parts of the image. What I mean by shiny parts is where the sunlight shines and the area is white-ish than any other point area on image. Here is an example of what I am talking about; http://www.sensorprod.com/news/pr/2007-09_hydraulics/image01.jpg There you can see red and yellowish parts which are deteriorated. I ran into this issue when I play around with green curve. There is nothing wrong when I just change Red and Blue curves, but when it comes to Green one things change.

[sarpdoruk]

Any updates on this issue ? Still waiting.