Inputs only need to have a #path method.

Author: clowder

lib/mini_magick.rb

@@ -63,7 +63,7 @@ class << self
       def read(stream, ext = nil)
         if stream.is_a?(String)
           stream = StringIO.new(stream)
-        elsif stream.is_a?(File)
+        elsif stream.respond_to? :path
           if File.respond_to?(:binread)
             stream = StringIO.new File.binread(stream.path.to_s)
           else

test/image_test.rb

@@ -14,6 +14,19 @@ def test_image_from_blob
     end
   end
 
+  def test_image_from_tempfile
+    tempfile = Tempfile.new('magick')
+
+    File.open(SIMPLE_IMAGE_PATH, 'rb') do |f|
+      tempfile.write(f.read)
+      tempfile.rewind
+    end
+
+    image = Image.read(tempfile)
+    assert image.valid?
+    image.destroy!
+  end
+
   def test_image_open
     image = Image.open(SIMPLE_IMAGE_PATH)
     assert image.valid?