rmagick 和 OS X Lion

# 使用 RMagick 在 OS X Lion 上进行图像处理

bash
brew install imagemagick

bash
gem install rmagick

ruby
require 'rmagick'
image = Magick::Image.read('input.jpg').first
puts "图像格式：#{image.format}"
puts "宽度：#{image.columns}"
puts "高度：#{image.rows}"

ruby
require 'rmagick'
image = Magick::Image.read('input.jpg').first
scaled_image = image.scale(0.5)
scaled_image.write('output.jpg')

ruby
require 'rmagick'
image = Magick::Image.read('input.jpg').first
cropped_image = image.crop(100, 100, 300, 300)
cropped_image.write('output.jpg')

ruby
require 'rmagick'
image = Magick::Image.read('input.jpg').first
watermark = Magick::Draw.new
watermark.font = 'Arial'
watermark.pointsize = 36
watermark.gravity = Magick::CenterGravity
watermark.annotate(image, 0, 0, 0, 0, "Watermark Text")
image.write('output.jpg')