Rmagick pixel color value

I use rmagick to process each individual pixel of a bitmap. I need to get the color values ​​in depth 8 (256 colors), but unfortunately when I use a pixel. [Color] (for example, pixel. Red), I get them at a depth of 16. This happens even after I use the .quantize (256) image.

Here is the code:

require 'RMagick'
include Magick

image = ImageList.new("image.bmp")
image3 = image.quantize(number_colors = 256)
puts image3.number_colors

image2 = Image.new(image.columns, image.rows)

(0..image.columns).each do |x|
    (0..image.rows).each do |y|
        pixel = image3.pixel_color(x, y)

    print pixel.red
    print ", "
    print pixel.green
    print ", "
    print pixel.blue
    print "\n"

    image2.pixel_color(x, y, pixel)
    end
end

How can I get only 0..255 values?