r - How to reverse qplot color values -

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For qplot below, how can I change the color scale? The default goes from black to color, from 0 to 6, where 0 is black and 6 is a light color. I want it to go from color to black. 

  chart: Times opense from & lt; - qplot (log1p (amount), log1p (gift), data = model_data, color = log1p (open), size = log1p (amount), alpha = i (1/2))

Sorry I do not have any picture but I do not have any site to host the photo.


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