konva/lib/filters/Threshold.js

HTML5 2d canvas library.

import { Factory } from "../Factory.js";
import { Node } from "../Node.js";
import { getNumberValidator } from "../Validators.js";
export const Threshold = function (imageData) {
    const level = this.threshold() * 255, data = imageData.data, len = data.length;
    for (let i = 0; i < len; i += 1) {
        data[i] = data[i] < level ? 0 : 255;
    }
};
Factory.addGetterSetter(Node, 'threshold', 0.5, getNumberValidator(), Factory.afterSetFilter);