import '../../../assert/js/assert.js';
import '../../../globals.js';
import { ColorMatrixFilter } from '../imports.js';
export default class Brightness extends ColorMatrixFilter {
    private readonly amount;
    /**
     * @param amount - How bright to be, from 0 (dark), 1 (normal), or larger values to brighten
     */
    constructor(amount: number);
    /**
     * Returns the CSS-style filter substring specific to this single filter, e.g. `grayscale(1)`. This should be used for
     * both DOM elements (https://developer.mozilla.org/en-US/docs/Web/CSS/filter) and when supported, Canvas
     * (https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/filter).
     */
    getCSSFilterString(): string;
    isDOMCompatible(): boolean;
    static readonly BLACKEN: Brightness;
}
//# sourceMappingURL=Brightness.d.ts.map