brightness()
Summary
Adjust the brightness of an element’s color, for use by the filter property. A value of 100% or decimal value of 1 leaves the image as is, while 0 produces black. Increasing the value from 1 or 100% brightens pixels from their original values.
This CSS property value is reflected in the following image:
filter: brightness(40%);
filter: brightness(0.4); /* same */
Examples
The following example shows the difference between two images, where one has a brightness of 50%: 
<!DOCTYPE html>
<html>
<head>
<title>Filter example</title>
<style>
.foo {
float: left;
}
.bar {
-webkit-filter: brightness(50%);
}
</style>
</head>
<body>
<img src="/logo/wplogo_transparent_xlg.png" class="foo" />
<img src="/logo/wplogo_transparent_xlg.png" class="foo bar" />
</body>
</html>
Notes
The CSS filter corresponds to this SVG filter definition, based on a variable amount passed to the function:
<filter id="brightness">
<feComponentTransfer>
<feFuncR type="linear" slope="[amount]"/>
<feFuncG type="linear" slope="[amount]"/>
<feFuncB type="linear" slope="[amount]"/>
</feComponentTransfer>
</filter>
Related specifications
- Filter Effects 1.0
- Editor’s Draft
- Filter Effects 1.0
- Working Draft
See also
Related articles
Filters
brightness()