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diff --git a/tests/Images/External/README.md b/tests/Images/External/README.md
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index 000000000..936b15e6a
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+### ReferenceOutput
+Contains images to validate against in ImageSharp tests. In most cases the file hierarchy follows the hierarchy of `ActualOutput`
+
+### tools
+Various utilities to help dealing with images.
+- `optipng.exe`: [lossless PNG compressor](http://optipng.sourceforge.net/), to keep the `ReferenceImages` folder as small as possible
+- `optimize-all.cmd`: Runs lossless optimizer for reference PNG-s. Currently it has to be manually edited to add new test class directories.
+- [`dump-jpeg-coeffs.exe`](https://github.com/SixLabors/Imagesharp/blob/master/tests/Images/External/tools/jpeg/README.md)
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diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_MitchellNetravali.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_MitchellNetravali.png
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index 000000000..9216e2f17
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+++ b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_MitchellNetravali.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 27303
diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_NearestNeighbor.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_NearestNeighbor.png
new file mode 100644
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--- /dev/null
+++ b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_NearestNeighbor.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3dfbc7ca2c42fba08daff44f29fdc64f76cb5515ee8f0fd5798270ed64fdeb27
+size 26282
diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Robidoux.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Robidoux.png
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+++ b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Robidoux.png
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+version https://git-lfs.github.com/spec/v1
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diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Spline.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Spline.png
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diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Triangle.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Triangle.png
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diff --git a/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Welch.png b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Welch.png
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--- /dev/null
+++ b/tests/Images/External/ReferenceOutput/Transforms/SkewTests/Skew_WorksWithAllResamplers_ducky_Welch.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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diff --git a/tests/Images/External/tools/jpeg/README.md b/tests/Images/External/tools/jpeg/README.md
new file mode 100644
index 000000000..5078f7f16
--- /dev/null
+++ b/tests/Images/External/tools/jpeg/README.md
@@ -0,0 +1,13 @@
+### dump-jpeg-coeffs.exe
+Usage:
+```
+dump-jpeg-coeffs <input.jpg> [output.dctdump]
+```
+
+Dumps the raw DCT blocks of the input image into a binary file. The output file follows the following liear layout:
+1. The number of components as `Int16`
+2. For each component: (2.1) widthInBlocks as `Int16` (2.2) heightInBlocks as `Int16`
+3. The block data as a raw `Int16` dump
+
+The source code could be found here:
+https://github.com/antonfirsov/libjpeg-turbo/blob/dump-jpeg-coeffs_/jcstest.cpp
diff --git a/tests/Images/External/tools/jpeg/dump-jpeg-coeffs.exe b/tests/Images/External/tools/jpeg/dump-jpeg-coeffs.exe
new file mode 100644
index 000000000..1b490fa8a
Binary files /dev/null and b/tests/Images/External/tools/jpeg/dump-jpeg-coeffs.exe differ
diff --git a/tests/Images/External/tools/jpeg/jpeg62.dll b/tests/Images/External/tools/jpeg/jpeg62.dll
new file mode 100644
index 000000000..ebf21ab14
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diff --git a/tests/Images/External/tools/jpeg2png-usage-example.cmd b/tests/Images/External/tools/jpeg2png-usage-example.cmd
new file mode 100644
index 000000000..3d7253a5d
--- /dev/null
+++ b/tests/Images/External/tools/jpeg2png-usage-example.cmd
@@ -0,0 +1,2 @@
+rem make sure the destination directory "test" exists!
+jpeg2png.cmd ..\..\Input\Jpg\baseline .\test
\ No newline at end of file
diff --git a/tests/Images/External/tools/jpeg2png.cmd b/tests/Images/External/tools/jpeg2png.cmd
new file mode 100644
index 000000000..60d37cfa4
--- /dev/null
+++ b/tests/Images/External/tools/jpeg2png.cmd
@@ -0,0 +1,9 @@
+@echo off
+
+set SourceDir=%1
+set DestDir=%2
+
+echo Converting all jpeg-s in %InputDir% to PNG into %DestDir%
+
+for /r "%SourceDir%" %%f in (*.jpeg *.jpg) do magick convert %%f "%DestDir%\%%~nf.png"
+
diff --git a/tests/Images/External/tools/optimize-all.cmd b/tests/Images/External/tools/optimize-all.cmd
new file mode 100644
index 000000000..75b03e7d0
--- /dev/null
+++ b/tests/Images/External/tools/optimize-all.cmd
@@ -0,0 +1 @@
+optipng.exe -o 7 ../ReferenceOutput/**/*.png
\ No newline at end of file
diff --git a/tests/Images/External/tools/optipng.exe b/tests/Images/External/tools/optipng.exe
new file mode 100644
index 000000000..49f9dee09
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