Use dominant color as background for resize_and_pad

[storuky]

Hi! Thanx for your work.
I want to use dominant color as background for resize_and_pad. Like:

version :thumb do
  process :resize_and_pad => [230, 140, dominant_color, "Center"]
end

What can you advise me to do?

Update: Solved. I make it through my custom cw-processor