我最近使用Rails实现了Paperclip,并想尝试ImageMagick的一些过滤器选项,例如blur。我还没有找到任何有关如何执行此操作的示例。它是否通过:style传递为另一种选择?
:styles => { :medium => "300x300#", :thumb => "100x100#" }
@plang的答案是正确的,但我想为模糊提供确切的解决方案,以防万一有人在寻找并发现以下问题:
:convert_options => { :all => "-blur 0x8" }
// -blur {radius}x{sigma}
哪个改变了这个:
对此:
最佳答案
我没有对此进行测试,但是您应该可以使用“convert_options”参数,如下所示:
:convert_options => { :all => ‘-colorspace Gray’ }
看看https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/thumbnail.rb
我个人使用我自己的处理器。
型号中:
has_attached_file :logo,
:url => PaperclipAssetsController.config_url,
:path => PaperclipAssetsController.config_path,
:styles => {
:grayscale => { :processors => [:grayscale] }
}
在lib中:
module Paperclip
# Handles grayscale conversion of images that are uploaded.
class Grayscale < Processor
def initialize file, options = {}, attachment = nil
super
@format = File.extname(@file.path)
@basename = File.basename(@file.path, @format)
end
def make
src = @file
dst = Tempfile.new([@basename, @format])
dst.binmode
begin
parameters = []
parameters << ":source"
parameters << "-colorspace Gray"
parameters << ":dest"
parameters = parameters.flatten.compact.join(" ").strip.squeeze(" ")
success = Paperclip.run("convert", parameters, :source => "#{File.expand_path(src.path)}[0]", :dest => File.expand_path(dst.path))
rescue PaperclipCommandLineError => e
raise PaperclipError, "There was an error during the grayscale conversion for #{@basename}" if @whiny
end
dst
end
end
end
对于简单的灰度转换,这可能不是100%必需的,但它可以工作!
关于ruby-on-rails - Rails回形针如何使用ImageMagick的滤镜选项?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4435922/