2

我正在关注 jcrop rails 教程,但遇到了障碍。归结为回形针是从原始文件生成缩略图的事实,但我需要从另一种样式生成它。原始文件在产品照片和文档边缘之间没有任何空间。因此,我无法进一步裁剪。为了解决这个问题,我制作了另一种具有白色像素填充的样式。这就是我想要从中生成缩略图的内容。

# croppable is the one with the padding...it's what shows up in the crop view.
# I want :thumb to be generated from THAT style, not :original.
# When generating from :original, the crop offset/size is screwed because the dimensions of :original don't match :cropped
# and I can't crop beyond the pixel dimensions of :original.
has_attached_file :photo, :styles => {
                    :thumb => { :geometry => "300x300#", :format => :jpg, :processors => [:cropper] },
                    :general => ["150x375", :jpg],
                    :show => ["x425", :jpg],
                    :croppable => ["1200x1200>", :jpg]
        },
        :url  => "/assets/wines/:style/:wine_name",
        :path => ":rails_root/public:url",
        :default_url => ":wine_default",
        :default_path => ":rails_root/public:wine_default",
        :default_style => :show,
        :convert_options => {
            :thumb => '-gravity center -rotate -30',
            :croppable => '-gravity center -extent 1200x1200',
            :general => '-gravity center -extent 150x375 -quality 95',
            :all => '-quality 100 -antialias -flatten -background white -unsharp 0.3x0.3+5+0'
        },
        :processors => [:thumbnail, :compression]
4

2 回答 2

3

我偶然发现了一个别人在网上制作并为自己使用的处理器。有关高级使用信息,请访问http://pjkh.com/articles/speeding-up-thumbnail-generation-with-paperclip/了解详细信息。

recursive_thumbnail.rb(包含在 lib/paperclip_processors 中)

module Paperclip
    class RecursiveThumbnail < Thumbnail
      def initialize file, options = {}, attachment = nil
        super Paperclip.io_adapters.for(attachment.styles[options[:thumbnail] || :original]), options, attachment
      end
    end
end

并为您的模型:

:styles => {
    :croppable => ["1200x1200>", :jpg],
    :show => ["x425", :jpg],
    :general => ["150x375", :jpg],
    :thumb => {
        :geometry => "150x150^",
        :format => :jpg,
        :processors => [:recursive_thumbnail] },
        :thumbnail => :croppable
    }
于 2013-10-28T19:45:12.807 回答
0

也许这会帮助你或像我这样谷歌导致这个问题的人。

https://github.com/thoughtbot/paperclip/wiki/Thumbnail-Generation

生成/重新生成缩略图

注意:如果您在 paperclip_defaults[:path] 中有 :hash 并且在您的 paperclip_defaults[:hash_data] 中有 :updated_at ,则仅重新生成以下某些示例中描述的几种定义样式中的一种将导致所有其他样式的路径/网址损坏(默认情况下你有)。除非你真的知道自己在做什么,否则不要这样做。

您可以使用 Paperclip 的 rake 任务(重新)生成您的缩略图。使用我们上面的示例类:

bundle exec rake paperclip:refresh:thumbnails CLASS=User
于 2017-09-14T11:59:17.137 回答