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@@ -202,6 +202,7 @@ module Paperclip
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       @styles.each do |name, args|
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         begin
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           dimensions, format = args
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+          dimensions = dimensions.call(instance) if dimensions.respond_to?(:call)
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           @queued_for_write[name] = Thumbnail.make(@queued_for_write[:original], 
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                                                    dimensions,
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                                                    format, 

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@@ -70,6 +70,28 @@ class AttachmentTest < Test::Unit::TestCase
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     end
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   end
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+  context "An attachment with a style that is a proc" do
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+    setup do
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+      rebuild_model :styles => {:custom => proc{|i| "#{i.width}x#{i.height}#{i.modifier}"}}
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+      Dummy.class_eval do
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+        attr_accessor :height, :width, :modifier
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+      end
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+      @dummy = Dummy.new
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+      @file = File.new(File.join(File.dirname(__FILE__),
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+                                 "fixtures",
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+                                 "5k.png"))
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+    end
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+
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+    should "create a thumbnail with size 100x1000!" do
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+      @dummy.height = 1000
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+      @dummy.width = 100
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+      @dummy.modifier = "!"
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+      @dummy.avatar = @file
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+      assert @dummy.save
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+      assert_match(/100x1000/, `identify #{@dummy.avatar.path(:custom)}`)
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+    end
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+  end
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+
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   context "An attachment with similarly named interpolations" do
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     setup do
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       rebuild_model :path => ":id.omg/:id-bbq/:idwhat/:id_partition.wtf"