diff --git a/.gitignore b/.gitignore
index e2282e2..9e45fcc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,15 @@ target
 out
 .idea
 *.png
+
+# Don't ignore repo images
 !images/*.png
+
+# Don't ignore test sources
 !src/test/resources/*.png
+
+# Ignore converted versions in test resources
+*OUT.png
+
 *.iml
 *.xml
\ No newline at end of file
diff --git a/src/test/resources/grayscale.png b/src/test/resources/grayscale.png
new file mode 100644
index 0000000..a936e39
Binary files /dev/null and b/src/test/resources/grayscale.png differ
diff --git a/src/test/resources/indexed.png b/src/test/resources/indexed.png
new file mode 100644
index 0000000..55b5512
Binary files /dev/null and b/src/test/resources/indexed.png differ
diff --git a/src/test/resources/interlaced.png b/src/test/resources/interlaced.png
new file mode 100644
index 0000000..85fcb97
Binary files /dev/null and b/src/test/resources/interlaced.png differ
diff --git a/src/test/resources/rgb.png b/src/test/resources/rgb.png
new file mode 100644
index 0000000..10da326
Binary files /dev/null and b/src/test/resources/rgb.png differ
diff --git a/src/test/resources/rgba.png b/src/test/resources/rgba.png
new file mode 100644
index 0000000..b4cb39c
Binary files /dev/null and b/src/test/resources/rgba.png differ