minimagick的基本使用

创建缩略图

  image = MiniMagick::Image.from_file("input.jpg")
  image.resize "100x100"
  image.write("output.jpg")

通过blob数据创建缩略图

  image = MiniMagick::Image.from_blob(blob)
  image.resize "100x100"
  image.write("output.jpg")

多个参数的生成

  image = MiniMagick::Image.from_file("input.jpg")
  image.combine_options do |c|
    c.sample "50%"
    c.rotate "-90>"
  end
  image.write("output.jpg")

合成两张图

  image = Image.from_file("original.png")
  result = image.composite(Image.open("watermark.png", "jpg") do |c|
    c.gravity "center"
  end
  result.write("my_output_file.jpg")

  image = MiniMagick::Image.new("input.jpg")
  image.resize "100x100"

得到图本身相关的元数据

  image = MiniMagick::Image.from_file("input.jpg")
  image[:width]               # will get the width (you can also use :height and :format)
  image["EXIF:BitsPerSample"] # It also can get all the EXIF tags
  image["%m:%f %wx%h"]        # Or you can use one of the many options of the format command

更多参照http://www.imagemagick.org/script/command-line-options.php

评论

2 楼 HeArtMe 2012-11-09  

请问，怎么用minimagick语法来draw text with shadow,让画在图片上的字带文字阴影呢？

1 楼 hexawing 2011-04-02  

请问，你遇到过用MiniMagick往图片上加汉字出现乱码的问题吗？比如这样

require 'rubygems'
require "mini_magick"
img = MiniMagick::Image.from_file("d:/cmpsign.gif")
img.combine_options do |c|
 c.gravity 'Southwest'
 c.pointsize '20'
 c.font "c:windows/fonts/yahei_mono.ttf"
 c.draw 'text 10,0 "我不知道"'
 c.fill("#FF0000")
end
img.write("d:/a.gif")