使用ImageIO.write将其保存为PNG文件后，奇怪的颜色更改为BufferedImage

我一直在尝试制作一个Java程序，该程序将允许某些像素的颜色更改为中的其他颜色BufferedImage，但是正在绘制的颜色似乎覆盖了旧的颜色。这就是我的意思：

这是当前在.java文件中的代码：

static BufferedImage image = null;
static File file = null;
static int height;
static int width;
static int[][][] pixelStorage;
static int pixel;
static int getPixelDataOutput = 0;
static Random random = new Random();

public static void main(String args[]) throws IOException {

    System.out.println("test");

    try {
        file = new File("C:\\Users\\kkosy\\Dev\\Java\\Random\\Images - Color Changer\\Images\\input.png");
    }catch(Exception exception) {
        System.out.println(exception);
    }

    image = ImageIO.read(file);

    height = image.getHeight();
    width = image.getWidth();

    pixelStorage = new int[height][width][4];

    for(int h = 0; h < height - 1; h++) {
        for(int w = 0; w < width - 1; w++) {
            savePixelData(w, h);
            if(getPixelData(w,h,"r") == 0){
                System.out.println();
                printPixelData(w,h,"Before -- ");
                setPixelData(w,h,255,0,0,255);
                printPixelData(w,h,"After -- ");
            }
        }
    }

    try {
        file = new File("C:\\Users\\kkosy\\Dev\\Java\\Random\\Images - Color Changer\\Images\\output.png");
        ImageIO.write(image, "jpg", file);
    }catch(Exception exception){
        System.out.println(exception);
    }

}

private static void savePixelData(int x, int y) {
    pixel = image.getRGB(x,y);
    pixelStorage[y][x][0] = (pixel >> 24) & 0xff;
    pixelStorage[y][x][1] = (pixel >> 16) & 0xff;
    pixelStorage[y][x][2] = (pixel >> 8) & 0xff;
    pixelStorage[y][x][3] = pixel & 0xff;
    //printPixelData(x,y,"");

}

private static void setPixelData(int x, int y, int alpha, int red, int green, int blue) {
    int setPixel = (alpha << 24) | (red << 16) | (green << 8) | (blue);
    image.setRGB(x, y, setPixel);
    image.setRGB(x, y, new Color(red,green,blue).getRGB());
}

private static void printPixelData(int x, int y, String arguments) {
    System.out.println(arguments + "" + pixelStorage[y][x][0] + " " + pixelStorage[y][x][1] + " " + pixelStorage[y][x][2] + " " + pixelStorage[y][x][3] + " ");
}

private static int getPixelData(int x, int y, String argb) {
    switch(argb) {
    case "a": {
        getPixelDataOutput = pixelStorage[y][x][0];
        break;
    }
    case "r": {
        getPixelDataOutput = pixelStorage[y][x][1];
        break;
    }
    case "g": {
        getPixelDataOutput = pixelStorage[y][x][2];
        break;
    }
    case "b": {
        getPixelDataOutput = pixelStorage[y][x][3];
        break;
    }
    }
    return getPixelDataOutput;
}

我不知道为什么它会输出这样的图像。也许setRGB()是这些方面的。