PDF::Writer：PDF::SimpleTable#shade_color, #shade_color=

everyday Ruby 
require 'pdf/simpletable'

pdf = PDF::Writer.new

PDF::SimpleTable.new do |tab|
  tab.column_order = %w(col1 col2 col3)

  p tab.shade_color
  tab.shade_color = Color::RGB::Blue
  tab.show_lines = :all

  data = [
    { "col1" => "foo", "col2" => "bar", "col3" => "baz" },
  ]

  tab.data.replace data
  tab.render_on(pdf)
end

pdf.save_as("2008040500.pdf")

で、

#<Color::RGB:0x40252b38 @r=0.8, @b=0.8, @g=0.8>