diff --git a/data/brushes/Round-Brush.png b/data/brushes/Round-Brush.png
index 591b6fc..b1ba335 100644
Binary files a/data/brushes/Round-Brush.png and b/data/brushes/Round-Brush.png differ
diff --git a/data/brushes/Round-Hard.png b/data/brushes/Round-Hard.png
index da3bfc4..4f32195 100644
Binary files a/data/brushes/Round-Hard.png and b/data/brushes/Round-Hard.png differ
diff --git a/data/brushes/Square-Hard.png b/data/brushes/Square-Hard.png
index e2c57d4..853847e 100644
Binary files a/data/brushes/Square-Hard.png and b/data/brushes/Square-Hard.png differ
diff --git a/data/thumbs/Round-Brush.png b/data/thumbs/Round-Brush.png
index 591b6fc..1c0be4c 100644
Binary files a/data/thumbs/Round-Brush.png and b/data/thumbs/Round-Brush.png differ
diff --git a/data/thumbs/Round-Hard.png b/data/thumbs/Round-Hard.png
index 0ec829d..064e967 100644
Binary files a/data/thumbs/Round-Hard.png and b/data/thumbs/Round-Hard.png differ
diff --git a/data/thumbs/Square-Hard.png b/data/thumbs/Square-Hard.png
index e2c57d4..1d0831c 100644
Binary files a/data/thumbs/Square-Hard.png and b/data/thumbs/Square-Hard.png differ
diff --git a/extra/makebrush.ps1 b/extra/makebrush.ps1
new file mode 100644
index 0000000..021df47
--- /dev/null
+++ b/extra/makebrush.ps1
@@ -0,0 +1,8 @@
+$files = Get-ChildItem ./in
+foreach ($f in $files)
+{
+    echo "Processing $($f.Name)"
+    magick convert "$($f.FullName)" -resize 512x512 tmp.png
+    magick convert tmp.png -background white -gravity center -extent 512x512 "./brushes/$($f.Name)"
+    magick convert "./brushes/$($f.Name)" -resize 64x64 "./thumbs/$($f.Name)"
+}