The filter functions are used to set visual effects on elements like contrast, brightness, hue rotation, opacity, on images, etc. Let us now see some filter functions −
Contrast
To set image contrast in CSS, use filter contrast(%). Remember, the value 0 makes the image black, 100% is for original image and default. Rest, you can set any value of your choice, but values above 100% would make the image with more contrast.
Example
Let us now see an example to adjust image contrast with CSS3 −
<!DOCTYPE html>
<html>
<head>
<style>
img.demo {
filter: brightness(120%);
filter: contrast(120%);
}
</style>
</head>
<body>
<h1>Learn MySQL</h1>
<img src="https://www.tutorialspoint.com/mysql/images/mysql-mini-logo.jpg" alt="MySQL" width="160" height="150">
<h1>Learn MySQL</h1>
<p>Below image is brighter and has more contrast than the original image above.</p>
<img class="demo" src="https://www.tutorialspoint.com/mysql/images/mysql-mini-logo.jpg" alt="MySQL" width="160" height="150">
</body>
</html>Output
Drop Shadow
To add drop shadow to image in CSS3, use the drop-shadow value for filter property. It has the following values −
h-shadow – To specify a pixel value for the horizontal shadow.
v-shadow – To specify a pixel value for the vertical shadow. Negative values place the shadow above the image.
blur – To add a blur effect to the shadow.
spread - Positive values causes the shadow to expand and negative to shrink.
color – To add color to the shadow
Example
Let us now see another example −
<!DOCTYPE html>
<html>
<head>
<style>
img.demo {
filter: brightness(120%);
filter: contrast(120%);
filter: drop-shadow(10px 10px 10px green);
}
</style>
</head>
<body>
<h1>Learn MySQL</h1>
<img src="https://www.tutorialspoint.com/mysql/images/mysql-mini-logo.jpg" alt="MySQL" width="160" height="150">
<h1>Learn MySQL</h1>
<img class="demo" src="https://www.tutorialspoint.com/mysql/images/mysql-mini-logo.jpg" alt="MySQL" width="160" height="150">
</body>
</html>Output
Sepia Effect
To apply sepia effect to images using CSS3, use the sepia value for filter property. The code is as follows −
Example
<!DOCTYPE html>
<html>
<head>
<style>
img.demo {
filter: sepia(100%);
}
</style>
</head>
<body>
<h1>Learn Spring Framework</h1>
<img src="https://www.tutorialspoint.com/spring/images/spring-mini-logo.jpg" alt="Spring Framework" width="160" height="150">
<h1>Learn Spring Framework</h1>
<img class="demo" src="https://www.tutorialspoint.com/spring/images/spring-mini-logo.jpg" alt="Spring Framework" width="160" height="150">
</body>
</html>Output
