我正在遵循jcrop轨道教程,但我遇到了一个障碍。归根结底,回形针正在从原始文件生成缩略图,但我需要从另一种样式生成缩略图。原始文件在产品镜头和文档边缘之间没有任何空间。因此,我不能再裁剪了。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]
我遇到了别人在网上制作的处理器,并为自己使用了它。有关详细信息,请参阅 http://pjkh.com/articles/speeding-up-thumbnail-generation-with-paperclip/以获取高级使用信息。
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
对于您的型号:
:styles => {
:croppable => ["1200x1200>", :jpg],
:show => ["x425", :jpg],
:general => ["150x375", :jpg],
:thumb => {
:geometry => "150x150^",
:format => :jpg,
:processors => [:recursive_thumbnail] },
:thumbnail => :croppable
}
也许这会帮助你或像我这样的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:仅再生几个已定义样式之一,如中所述 下面的一些示例将导致所有路径/URL 损坏 其他样式,如果您的paperclip_defaults 中有 :hash[:p ath] 和 :updated_at 在你的paperclip_defaults[:hash_data] (你有 默认值)。除非你真的知道自己在做什么,否则不要这样做。
您可以使用回形针的耙子(重新)生成缩略图 任务。使用上面的示例类:
bundle exec rake paperclip:refresh:thumbnails CLASS=User