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How Can I Achieve a Defined Blur Effect in CSS3 While Preserving Sharp Edges?

Barbara StreisandOriginal: 2024-11-16 14:10:03371browse

Achieving Defined Edges with CSS3 Filter Blur

When applying a blur effect to an image using the CSS filter property, a common issue arises: the edges of the image also become blurred. This can result in an undesirable outcome, particularly when sharp lines or details need to be preserved.

To resolve this problem and maintain defined edges, a clever technique can be employed. By placing the blurred image within a

element and applying certain CSS styles, it's possible to create an "inset blur" effect.

The following code snippet demonstrates how to achieve this effect:

img {
    filter: blur(5px);
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    margin: -5px -10px -10px -5px;
}

div {
    overflow: hidden;
}

In this code, the element is contained within a

with overflow set to hidden. This ensures that the blurred image is cropped at the edges of the

, eliminating the spillover of the blur effect into the surroundings.

Furthermore, negative margins are applied to the element to slightly shift it within the

. The values of these margins can be adjusted to create the desired amount of blur while preserving the edges.

This technique effectively creates a defined blur effect, keeping the edges of the image sharp while softening the details within.

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