# File lib/color/rgb.rb, line 215
215:   def mix_with(mask, opacity)
216:     opacity /= 100.0
217:     rgb = self.dup
218:     
219:     rgb.r = (@r * opacity) + (mask.r * (1 - opacity))
220:     rgb.g = (@g * opacity) + (mask.g * (1 - opacity))
221:     rgb.b = (@b * opacity) + (mask.b * (1 - opacity))
222: 
223:     rgb
224:   end