you are welcome Chals.
Mongo has found the "auto curves" tool to be one of the most useful if an image looks a little off is some respect - luminance, colour cast etc. The very big "However" is that this tool either gives you a near perfect result or an absolutely terrible one. You will know immediately which of these you get. Luckily, if it is the wrong result, you can always "undo" that adjustment. For the most part, Mongo has found it hits the mark 8 or 9 times out of 10 and is therefore worth a try in the right circumstances.