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Showing content from https://webplatform.github.io/docs/css/functions/brightness below:

brightness() · WebPlatform Docs

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>

View live example

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