diff --git a/.gitattributes b/.gitattributes
index d9699ca594b8c232aed01e78705c275cd9245e52..d8fb2c4ac07090dae4adc2207151fd72e1b3b0fe 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,6 +3,7 @@
 *.db binary
 *.gif binary
 *.gz binary
+*.png binary
 *.pnm binary
 *.rs binary
 init_nt -text -crlf
diff --git a/tutorial/circle50.pnm b/tutorial/circle50.pnm
new file mode 100644
index 0000000000000000000000000000000000000000..1ba356f633bf6bece8892e4e908c835467c3880f
Binary files /dev/null and b/tutorial/circle50.pnm differ
diff --git a/tutorial/ryoki_carrot.png b/tutorial/ryoki_carrot.png
new file mode 100644
index 0000000000000000000000000000000000000000..94b2201a1d6e4ba515829f341c61cf19c6e58188
Binary files /dev/null and b/tutorial/ryoki_carrot.png differ