如何将缩略图生成规则从回形针转换为载波

Question

我正在从 Paperclip 迁移到 Carrierwave。这里我尝试转换缩略图生成的处理命令：

  has_attached_file :image,
    styles: {
      thumb: '220x140#',
      big: '620x600>',
      no_proportion: '255x162!'
    },
    convert_options: {
      all: '-strip',
      thumb: '-delete 1--1',
      no_proportion: '-delete 1--1'
    }

我计划使用MiniMagick。我发现我从 220x140# 转换为 resize_to_fill(220,140)，但我不确定如何转换所有其他命令。

PS 如果我可以重用现有的 ImageMagick 命令和参数，甚至用于调整大小（即不使用内置帮助程序调整器），那就更好了。

Answer 1

我做了以下事情。但我不确定它是否完全等效。

  process :strip

  # Create different versions of your uploaded files:
  version :thumb do
    process :resize_to_fill => [220,140]
  end
  version :mobile do
    process :resize_to_fill => [320,210]
  end
  version :mobile_small do
    process :resize_to_fill => [256,168]
  end
  version :big do
    process :resize_to_limit => [620,600]
  end
  version :groupbuy_ad do
    process :resize_to_fill => [96,60]
  end
  version :email do
    process :resize_to_fill => [125,125]
  end
  version :widget_165 do
    process :resize_to_fill => [165,105]
  end
  version :widget_100 do
    process :resize_to_fill => [100,64]
  end
  version :no_proportion do
    process :resize => '255x162!'
  end

  def strip
    manipulate! do |img|
      img.strip
      img = yield(img) if block_given?
      img
    end
  end

  def resize(dimension)
    manipulate! do |img|
      img.resize dimension
      img = yield(img) if block_given?
      img
    end
  end

  def get_first_frame
    manipulate! do |img|
      img = img.delete '1--1'
    end
  end