彩色照片转化为黑白照片

来源：互联网发布：单片机小车制作编辑：程序博客网时间：2024/06/12 01:15
    /**     * 将彩色图转换为纯黑白二色     *     * @param bmp 位图     * @return 返回转换好的位图     */    public static Bitmap convertToBlackWhite(Bitmap bmp) {        int width = bmp.getWidth(); // 获取位图的宽        int height = bmp.getHeight(); // 获取位图的高        int[] pixels = new int[width * height]; // 通过位图的大小创建像素点数组        bmp.getPixels(pixels, 0, width, 0, 0, width, height);        int alpha = 0xFF << 24;        for (int i = 0; i < height; i++) {            for (int j = 0; j < width; j++) {                int grey = pixels[width * i + j];                //分离三原色                int red = ((grey & 0x00FF0000) >> 16);                int green = ((grey & 0x0000FF00) >> 8);                int blue = (grey & 0x000000FF);                //转化成灰度像素                grey = (int) (red * 0.3 + green * 0.59 + blue * 0.11);                grey = alpha | (grey << 16) | (grey << 8) | grey;                pixels[width * i + j] = grey;            }        }        //新建图片        Bitmap newBmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);        //设置图片数据        newBmp.setPixels(pixels, 0, width, 0, 0, width, height);        Bitmap resizeBmp = ThumbnailUtils.extractThumbnail(newBmp, 380, 460);        return resizeBmp;    }
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