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tedster - 2:37 am on Mar 2, 2012 (gmt 0)
I'd first try using the Photoshop "Hue" slider under Image > Adjustments > Hue/Saturation... and I'd still try to work that process by eye. There is a lot to color that a numeric hex match might not give the best solution to. By experimenting with all three sliders (hue, saturation, brightness) I find I can usually get the most aesthetically pleasing final results in cases like this.