图像在Rails上的ruby中调整大小 [英] Image resize in ruby on rails

问题描述

像这样，我目前正在我的ruby应用程序中上传文件(图像)..我需要在上传后调整图像大小...请帮助调整图像大小

Like this I am currently uploading a file ( image ) in my ruby application .. I need to resize the image after uploading ... please help for resizing the image

uploaded_io = params [:category] ​​[:thumb]

uploaded_io = params[:category][:thumb]

if uploaded_io != ""
  name = uploaded_io.original_filename
  if(FileTest.exist?("#{RAILS_ROOT}/public/data/#{name}"))
    id = Category.maximum('id').to_s
    id = id.to_i+ 1
    name =id.to_s+"_"+name
  end

谢谢

推荐答案

如果您已经安装了imagemagick-则使用ImageScience或MiniMagick代替，它们使用的资源都少得多，工作速度也更快，并且就像普通的gem一样安装(其实对图像科学的安装要多一些

If you have imagemagick already installed - then use ImageScience or MiniMagick instead, they both use much less resources and work faster, and are installed just as a common gem (actually a little bit more installation for imagescience)

ImageScience:

ImageScience:

ImageScience.with_image("#{RAILS_ROOT}/public/data/#{name}") do |image|
  image.thumbnail(100) do |thumb|
    thumb.save <path_to_small_image to be saved>
  end     
end

MiniMagick:

MiniMagick:

MiniMagick::Image.new("#{RAILS_ROOT}/public/data/#{name}").resize "100x100"

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