复合覆盖与迷你Magick和Carrierwave

Question

我一直试图将一个图像叠加在另一个图像上并遇到问题。

运行方法后，仅显示第一张图像。我无法弄清楚原因。

version :final_product do
 process :frame_photo
end


def frame_photo
  second_image = MiniMagick::Image.open("http://s3-us-west-2.amazonaws.com/luminoto-modal/4x5-cream-blue.jpg")
  manipulate! do |img|
    result = img.composite(second_image) do |c|
      c.compose "Over"    # OverCompositeOp
      c.gravity "Center" # copy second_image onto first_image from (20, 20)
    end
    result
  end
end