stdDeviation

The stdDeviation attribute defines the standard deviation for the blur operation.

You can use this attribute with the following SVG elements:

• <feDropShadow>
• <feGaussianBlur>

Example

html,
body,
svg {
 height: 100%;
}

<svg viewBox="0 0 480 200" xmlns="http://www.w3.org/2000/svg">
 <filter id="gaussianBlur1">
 <feGaussianBlur stdDeviation="1" />
 </filter>
 <filter id="gaussianBlur2">
 <feGaussianBlur stdDeviation="5" />
 </filter>
 <filter id="gaussianBlur3" x="-30%" y="-30%" width="160%" height="160%">
 <feGaussianBlur stdDeviation="10" />
 </filter>
 <circle cx="100" cy="100" r="50" filter="url(#gaussianBlur1)" />
 <circle cx="240" cy="100" r="50" filter="url(#gaussianBlur2)" />
 <circle cx="380" cy="100" r="50" filter="url(#gaussianBlur3)" />
</svg>

Usage notes

<number-optional-number>

If two numbers are provided, the first number represents a standard deviation value along the x-axis. The second value represents a standard deviation along the y-axis. If one number is provided, then that value is used for both X and Y.

A negative value is forbidden. A value of zero disables the effect of the given filter primitive (i.e., the result is the filter input image). If stdDeviation is 0 in only one of X or Y, then the effect is that the blur is only applied in the direction that has a non-zero value.

Specifications

Browser compatibility

svg.elements.feDropShadow.stdDeviation

svg.elements.feGaussianBlur.stdDeviation