Image Masking Using HTML and CSS

Web design is an art that combines creativity and technology, providing a platform where visual aesthetics and functionality unite. One technique that is gaining popularity in the field of web design is CSS masking – a method that allows designers to manipulate the visibility of an image.

In this article, we will explore the concept of CSS masking and guide you in implementing it using HTML and CSS.

Introduction to CSS Masking

CSS masking involves overlaying one image or element with another, making some parts visible while hiding others. This technique can be used to create visual effects, such as images filled with text, gradient effects, or even animations. The essence of CSS masking lies in its ability to blend two visual layers, creating a composite image that can enhance the visual appeal of a webpage.

A glimpse of the code

Let's look at an example where CSS masking is applied to create a dynamic visual effect on a webpage. Below is an HTML and CSS code snippet that demonstrates this technique:

HTML CODE:

  <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Masking Image</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="img"></div>
</body>
</html>

CSS Code:

 
            *{
    margin: 0;
    padding: 0;
}

.img{
    position: relative;
    width: 100%;
    height: 100vh;
    background: url(/image/background.jpg);
    background-size: cover;
}

.img::before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: url(/image/image.jpg);
    background-size: cover;
    background-position: center;
    mix-blend-mode: screen;
}

Breaking Down the Code

HTML Structure: The HTML code establishes the basic structure of the webpage, incorporating a div element with a class of img that will be manipulated using CSS.
CSS Styling: The CSS code is where the magic of masking unfolds. The .img class is styled to cover the full viewport and is set with a background image. The ::before pseudo-element is utilized to overlay another image on top of the background.
Blend Mode: The mix-blend-mode: screen; property is pivotal in achieving the masking effect. The screen blend mode is used to lighten colors, depending on their overlap, creating a visually appealing blend between the two images.

Implementing CSS Masking: A Step-by-Step Guide

Choose Your Images: Select two images - one for the background and another to act as the mask. Ensure they are of high quality and relevant to your content.
HTML Setup: Implement the HTML structure, ensuring that the div element to be masked is placed correctly.
CSS Styling: Apply CSS to style the images, ensuring that the background image and the overlaying image are appropriately sized and positioned.
Apply Masking: Utilize the ::before pseudo-element and mix-blend-mode property to create the desired masking effect.
Responsive Design: Ensure that your design is responsive and visually consistent across various screen sizes.

Browser Compatibility: Test the design across different browsers to ensure compatibility and make necessary adjustments.

Conclusion

CSS Masking is a potent tool in a web designer's arsenal, enabling the creation of visually captivating effects that can enhance user engagement and elevate the aesthetic appeal of a website. By understanding and implementing the technique effectively, designers can explore a plethora of creative possibilities, crafting webpages that are not only functional but also visually enthralling.