chromium/third_party/blink/web_tests/css3/filters/effect-contrast.html

<img style="filter: contrast(0)" src="resources/reference.png">
<img style="filter: contrast(0.5)" src="resources/reference.png">
<img style="filter: contrast(1.0)" src="resources/reference.png">
<img style="filter: contrast(2)" src="resources/reference.png">
<img style="filter: contrast(5)" src="resources/reference.png">
<img style="filter: contrast(10)" src="resources/reference.png">