def create_color_string
      (0...img.height).map do |y|
        (0...img.width).map do |x|
          pix = self.img[x,y]
          pix_vals = [r(pix), g(pix), b(pix)]
          find_closest_term_color(pix_vals)
        end
      end.join
    end
def create_color_string
      (0...img.height).map do |y|
        (0...img.width).map do |x|
          pix = self.img[x,y]
          pix_vals = [r(pix), g(pix), b(pix)]
          find_closest_term_color(pix_vals)
        end
      end.join
    end
Iterates over each pixel of resized image to find closest color