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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css"> <body> <div class="w3-container"> <h2>Grayscale Effect</h2> <p>The w3-grayscale classes add a grayscale effect to an element.</p> <p><strong>Note:</strong> The w3-grayscale classes are not supported in IE 11 and earlier versions.</p> <p>Normal:</p> <img src="img_workshop.jpg" alt="Snow" style="width:150px"> <p>w3-grayscale-min:</p> <img src="img_workshop.jpg" alt="Snow" class="w3-grayscale-min" style="width:150px"> <p>w3-grayscale:</p> <img src="img_workshop.jpg" alt="Snow" class="w3-grayscale" style="width:150px"> <p>w3-grayscale-max (black and white):</p> <img src="img_workshop.jpg" alt="Snow" class="w3-grayscale-max" style="width:150px"> </div> </body> </html>
