@poupe/material-color-utilities/quantize/quantizer_celebi.js

Algorithms and utilities that power the Material Design 3 (M3) color system, including choosing theme colors from images and creating tones of colors; all in a new color space.

/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { QuantizerWsmeans } from './quantizer_wsmeans.js';
import { QuantizerWu } from './quantizer_wu.js';
/**
 * An image quantizer that improves on the quality of a standard K-Means
 * algorithm by setting the K-Means initial state to the output of a Wu
 * quantizer, instead of random centroids. Improves on speed by several
 * optimizations, as implemented in Wsmeans, or Weighted Square Means, K-Means
 * with those optimizations.
 *
 * This algorithm was designed by M. Emre Celebi, and was found in their 2011
 * paper, Improving the Performance of K-Means for Color Quantization.
 * https://arxiv.org/abs/1101.0395
 */
// material_color_utilities is designed to have a consistent API across
// platforms and modular components that can be moved around easily. Using a
// class as a namespace facilitates this.
//
// tslint:disable-next-line:class-as-namespace
export class QuantizerCelebi {
    /**
     * @param pixels Colors in ARGB format.
     * @param maxColors The number of colors to divide the image into. A lower
     *     number of colors may be returned.
     * @return Map with keys of colors in ARGB format, and values of number of
     *     pixels in the original image that correspond to the color in the
     *     quantized image.
     */
    static quantize(pixels, maxColors) {
        const wu = new QuantizerWu();
        const wuResult = wu.quantize(pixels, maxColors);
        return QuantizerWsmeans.quantize(pixels, wuResult, maxColors);
    }
}
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