载波为处理后的图像添加水印 [英] Carrierwave add a watermark to processed images

问题描述

我正在尝试使用以下代码从我从几种资源中获得的水印添加到处理后的图像中：

Im trying to add a watermark to processed images with below code I got from several resources:

def watermark
  manipulate! do |img|
    logo = Magick::Image.read("#{Rails.root}/assets/images/watermarks/watermark.png").first
    img = img.composite(logo, Magick::SouthEastGravity, Magick::OverCompositeOp)
  end
end

唯一的问题是，您猜对了，行不通。
我在日志/控制台中没有任何错误

Only problem is, you guess it, does not work. I get no errors in log/console whatsoever

这是我在上传的文件中调用的方法，例如：

This is my method inside my uploaded and called like:

def function
  version :thumb do
    process :resize_to_fill => [96, 96]
    process :watermark
  end
end

是否有任何关于为什么不起作用的日志的想法？我在系统（OSX）上安装了Rmagick gems和Imagemagick，并且调整图像大小确实可以正常工作。

Any thoughts on getting some logs on why this doesn't work? I have the Rmagick gems and Imagemagick installed on my system (OSX) And resizing of images does work correct.

推荐答案

我只是这样做

# Process files as they are uploaded:
process :resize_to_fill => [850, 315]
process :convert => 'png'
process :watermark

def watermark
  manipulate! do |img|
    logo = Magick::Image.read("#{Rails.root}/app/assets/images/watermark.png").first
    img = img.composite(logo, Magick::NorthWestGravity, 15, 0, Magick::OverCompositeOp)
  end
end

B

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