在android中将位图转换为sepia

public Bitmap convertToSepia(Bitmap originalBitmap) {
    int width = originalBitmap.getWidth();
    int height = originalBitmap.getHeight();

    Bitmap sepiaBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    int[] pixels = new int[width * height];
    originalBitmap.getPixels(pixels, 0, width, 0, 0, width, height);

    for (int i = 0; i < pixels.length; i++) {
        int pixel = pixels[i];
        int alpha = Color.alpha(pixel);
        int red = Color.red(pixel);
        int green = Color.green(pixel);
        int blue = Color.blue(pixel);

        int sepiaRed = (int) (red * 0.393 + green * 0.769 + blue * 0.189);
        int sepiaGreen = (int) (red * 0.349 + green * 0.686 + blue * 0.168);
        int sepiaBlue = (int) (red * 0.272 + green * 0.534 + blue * 0.131);

        sepiaRed = Math.min(sepiaRed, 255);
        sepiaGreen = Math.min(sepiaGreen, 255);
        sepiaBlue = Math.min(sepiaBlue, 255);

        int sepiaPixel = Color.argb(alpha, sepiaRed, sepiaGreen, sepiaBlue);
        pixels[i] = sepiaPixel;
    }

    sepiaBitmap.setPixels(pixels, 0, width, 0, 0, width, height);

    return sepiaBitmap;
}