Javascript Image Blur

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Michael Zippo 04.11.2021

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When you are designing a website, you may decide to add a blur effect to a certain image. For example, if you are designing a website for a cafe, you might want to blur an image so that you can place text in front of the image for the user to read.

This is where the CSS blur feature comes in. The blur feature applies a blur effect to a specified input image, which you can then use with the property "filter" to blur an image.

This tutorial will cover, for example, the basics of CSS Blur functionality and how you can use it to apply a blur effect to an image in your code. By the end of reading this tutorial, you will be an expert in using the CSS Blur feature.

CSS Filter

The CSS Filter property allows you to apply graphic effects to an element on a web page. Often the filter property is used to apply filters to images and backgrounds on a web page.

There are several filters offered by CSS. The opacity filter, for example, lets you make an element more or less visible, and the drop shadow filter lets you add a shadow under an element on a web page.

The syntax for applying a filter is as follows:

For this tutorial, we are going to focus on the CSS Blur feature, which adds a blur effect to an image.

CSS Blur

The CSS Blur Filter is a filter function that adds a blur effect to an image.

The syntax for using the blur filter is as follows:

In this syntax, "radius" refers to the radius of the blur effect that is to be applied. The higher the specified radius value, the more intense the blur added to a picture element will be. If you specify the value "0", no blur will be added to the picture element to which the style is applied.

The specified radius value can accept any length value, such as em, px, rem, and cm.

Let’s take an example to illustrate how this function works. Suppose we design a website for a local cafe. On the cafe’s homepage, they want an image of a cafe to appear. However, they want the image to appear with a blur effect with a radius of 2px. < br>

We could use the blur function and the filter property to do this. Here is the code we could use to create such an image with a blur function:

Our code returns: Click in the code editor above to see the output of our HTML / CSS code.

In our HTML file, we used an tag to add an image to our web page. This image refers to an image of a cafe. We use the "height" and "width" parameters to set the height and width of our image at 400px and 600px respectively.

In our CSS code, we use the property filter and the blur function to apply a blur effect to all tags on our web page. In this case, we are specifying a blur radius of 2px, which adds a slight blur effect to our image. As you can see above, the image of the coffee mug we’re using appears slightly blurry because we’ve used the blur effect.

Alternatively, if we wanted to specify a blur radius using some other unit of measure, we could do so by replacing "2px" with the value we want to use. So if we wanted our image to have a blur with a blur radius of 1.15 em, we could do that by overriding the "2px‚" blur radius that we specified above.