我想使用jpegoptim
或optipng
来压缩用户通过Paperclip上传的图片。
我将Paperclip模型配置为:
has_attached_file :image,
:styles => {:thumb => '50x50>', :preview => '270x270>' },
:url => "/system/:class/:attachment/:id/:basename_:style.:extension",
:path => ":rails_root/public/system/:class/:attachment/:id/:basename_:style.:extension"
问题1: 是否可以压缩用户上传的原始图像,然后让Paperclip调整大小,因此只有一个压缩过程?以及如何做到这一点?
问题2:
我将通过after_post_process
回调来完成它,我可以从image.queued_for_write
获取三个文件的所有实例,我想通过文件扩展名触发jpegoptim / optipng,但是当我使用{ {1}},我得到的结果是:current_format = File.extname(file.path)
。有没有获得扩展字符串.jpg20120508-7991-cqcpf2
?或者我只是检查扩展字符串是否包含在该字符串中是否安全?
答案 0 :(得分:4)
由于没有其他答案,这就是我在我的项目中如何做到这一点,似乎它已经好几个月了。
class AttachedImage < ActiveRecord::Base
belongs_to :attachable, :polymorphic => true
validates_attachment_presence :image
validates_attachment_content_type :image, :content_type=>['image/jpeg', 'image/png', 'image/gif']
has_attached_file :image,
:styles => {:thumb => '50x50>', :preview => '270x270>' },
# :processors => [:image_compressor],
:url => "/system/:class/:attachment/:id/:basename_:style.:extension",
:path => ":rails_root/public/system/:class/:attachment/:id/:basename_:style.:extension"
after_post_process :compress
private
def compress
current_format = File.extname(image.queued_for_write[:original].path)
image.queued_for_write.each do |key, file|
reg_jpegoptim = /(jpg|jpeg|jfif)/i
reg_optipng = /(png|bmp|gif|pnm|tiff)/i
logger.info("Processing compression: key: #{key} - file: #{file.path} - ext: #{current_format}")
if current_format =~ reg_jpegoptim
compress_with_jpegoptim(file)
elsif current_format =~ reg_optipng
compress_with_optpng(file)
else
logger.info("File: #{file.path} is not compressed!")
end
end
end
def compress_with_jpegoptim(file)
current_size = File.size(file.path)
Paperclip.run("jpegoptim", "-o --strip-all #{file.path}")
compressed_size = File.size(file.path)
compressed_ratio = (current_size - compressed_size) / current_size.to_f
logger.debug("#{current_size} - #{compressed_size} - #{compressed_ratio}")
logger.debug("JPEG family compressed, compressed: #{ '%.2f' % (compressed_ratio * 100) }%")
end
def compress_with_optpng(file)
current_size = File.size(file.path)
Paperclip.run("optipng", "-o7 --strip=all #{file.path}")
compressed_size = File.size(file.path)
compressed_ratio = (current_size - compressed_size) / current_size.to_f
logger.debug("#{current_size} - #{compressed_size} - #{compressed_ratio}")
logger.debug("PNG family compressed, compressed: #{ '%.2f' % (compressed_ratio * 100) }%")
end
end
答案 1 :(得分:2)
还有一些宝石可以优化回形针图像:
答案 2 :(得分:1)
可能是性能折衷,但我使用FFMPEG或AVCONV更好地压缩了图像。
sudo apt-get install ffmpeg
=初始化程序
Paperclip.options[:command_path] = "/usr/bin/" # see `which ffmpeg`
=模态
after_save :compress_with_ffmpeg
def compress_with_ffmpeg
[:thumb, :original, :medium].each do |type|
img_path = self.avtar.path(type)
Paperclip.run("ffmpeg", " -i #{img_path} #{img_path}")
end
end
我将1.7MB图像压缩为302.9KB !!!