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Get Image format and characteristics with identify
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gistfile1.md
@zhangyuan
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zhangyuan commented Sep 2, 2013

Use MiniMagick to fetch image dimensions.

post = Post.find 1234
image = Tempfile.new(RUBY_VERSION < '1.9' ? "Image": ['Image', ".jpg"])
image.binmode
image.write post.image.file.read
image.close

image = ::MiniMagick::Image.new(image.path, image)
image['dimensions']

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