diff --git a/src/tests/output/animation.gif.pdf b/src/tests/output/animation.gif.pdf
index a6b2826..fdfd460 100644
Binary files a/src/tests/output/animation.gif.pdf and b/src/tests/output/animation.gif.pdf differ
diff --git a/src/tests/output/gray.png.pdf b/src/tests/output/gray.png.pdf
new file mode 100644
index 0000000..5737760
Binary files /dev/null and b/src/tests/output/gray.png.pdf differ
diff --git a/src/tests/output/mono.png.pdf b/src/tests/output/mono.png.pdf
index eda3ec7..77c3704 100644
Binary files a/src/tests/output/mono.png.pdf and b/src/tests/output/mono.png.pdf differ
diff --git a/src/tests/output/normal.png.pdf b/src/tests/output/normal.png.pdf
index 2628c5d..2e34ad4 100644
Binary files a/src/tests/output/normal.png.pdf and b/src/tests/output/normal.png.pdf differ