回形针调整大小以适合矩形框 [英] Paperclip Resize to fit a rectangular box

问题描述

我有一个矩形图像，例如30x800像素

I have a rectangular image for example 30x800 pixels

如何使用paperclip缩放它以保持宽高比为100x100像素图像，边框填充空白区域？

How I can scale it with paperclip to preserve the aspect ratio to a 100x100 pixel image with borders filling the empty area ?

一个例子： http：/ /www.imagemagick.org/Usage/thumbnails/pad_extent.gif

推荐答案

  has_attached_file :image, :styles => { :thumb => "100x100>" }, 
    :convert_options => {:thumb => "-gravity center -extent 100x100"}

或者没有白色背景

  has_attached_file :image, :styles => { :thumb => "100x100>" }, 
    :convert_options => {:thumb => "-background red -gravity center -extent 100x100"}

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