diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ff04834..0783c3c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -17,3 +17,4 @@ require 'rubella/weighting/exponential'
 require 'rubella/weighting/per_overall_load'
 require 'rubella/output/base'
 require 'rubella/output/ascii'
+require 'rubella/output/image'
diff --git a/spec/unit/rubella/output/image/new_spec.rb b/spec/unit/rubella/output/image/new_spec.rb
new file mode 100644
index 0000000..588403f
--- /dev/null
+++ b/spec/unit/rubella/output/image/new_spec.rb
@@ -0,0 +1,34 @@
+require 'spec_helper'
+
+describe Rubella::Output::Image, '.new' do
+
+  it "creates a new Rubella::Output::Image" do
+    output = Rubella::Output::Image.new nil
+
+    expect(output).to be_kind_of(Rubella::Output::Image)
+  end
+
+  it "uses the given data" do
+    output = Rubella::Output::ImageImplementation.new Rubella::Storage.new([])
+
+    expect(output.data).to be_kind_of(Rubella::Storage)
+    expect(output.data.data).to eq([])
+  end
+
+  it "uses the given field_size" do
+    output = Rubella::Output::Image.new nil, 5
+
+    expect(output.field_size).to eq(5)
+  end
+
+  it "uses 15 as default field_size" do
+    output = Rubella::Output::Image.new nil
+
+    expect(output.field_size).to eq(15)
+  end
+
+end
+
+class Rubella::Output::ImageImplementation < Rubella::Output::Image
+  attr_reader :data
+end
diff --git a/spec/unit/rubella/output/image/render_spec.rb b/spec/unit/rubella/output/image/render_spec.rb
new file mode 100644
index 0000000..054c995
--- /dev/null
+++ b/spec/unit/rubella/output/image/render_spec.rb
@@ -0,0 +1,38 @@
+require 'spec_helper'
+
+describe Rubella::Output::Image, '.render' do
+
+  it "returns a Magick::Image" do
+    data    = [
+        [0, 0.1, 0.01],
+        [0, 0.3, 0.55],
+        [1, 0.64, 0.4]
+      ]
+    storage = Rubella::Storage.new(data)
+    output  = Rubella::Output::Image.new storage
+
+    expect(output.render).to be_kind_of(Magick::Image)
+  end
+
+  it "creates an image from the given data" do
+    data    = [
+        [0, 0.1, 0.01],
+        [0, 0.3, 0.55],
+        [1, 0.64, 0.4]
+      ]
+    storage = Rubella::Storage.new(data)
+    output  = Rubella::Output::Image.new storage, 2
+
+    image = [255, 253, 253, 255, 253, 253, 255, 115, 115, 255, 115, 115, 255,
+      153, 153, 255, 153, 153, 255, 253, 253, 255, 253, 253, 255, 115, 115, 255,
+      115, 115, 255, 153, 153, 255, 153, 153, 255, 229, 229, 255, 229, 229, 255,
+      179, 179, 255, 179, 179, 255, 91, 91, 255, 91, 91, 255, 229, 229, 255,
+      229, 229, 255, 179, 179, 255, 179, 179, 255, 91, 91, 255, 91, 91, 255,
+      255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 1, 1, 255, 1,
+      1, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 1, 1,
+      255, 1, 1].pack('C*')
+
+    expect(output.render.export_pixels_to_str).to eq(image)
+  end
+
+end