Java Image - read image and separate RGB array values

Reading image and getting values of Red Green Blue and Alpha values in separate 2d arrays :

public class TestImagesss {
    public static void main(String[] args) {
        int value[][]=getRGB(getImage("test.jpg"));
        int valueR[][]=getR(getImage("test.jpg"));
    }
    //.... code below :}

The Code for Reading Image from File and getting RGB values separately :

   
    public static BufferedImage getImage(String imageName) {
 try {
  File input = new File(imageName);
  BufferedImage image = ImageIO.read(input);
  return image;
 } catch (IOException ie) {
  System.out.println("Error:" + ie.getMessage());
 }
 return null;
    }
    public static int [][] getRGB(BufferedImage img) {
        int w1 = img.getWidth();
        int h1 = img.getHeight();
        int value[][] = new int[w1][h1];
        for (int i = 0; i < w1; i++) {
            for (int j = 0; j < h1; j++) {
                value[i][j] = img.getRGB(i, j); // store value
            }
        }
        return value;
    }
    public static int [][] getR(BufferedImage img) {
        int w1 = img.getWidth();
        int h1 = img.getHeight();
        int value;
        int valueR[][] = new int[w1][h1];
        for (int i = 0; i < w1; i++) {
            for (int j = 0; j < h1; j++) {
                value = img.getRGB(i, j); // store value
                valueR[i][j] = getRed(value);
            }
        }
        return valueR;
    }
    public static int [][] getG(BufferedImage img) {
        //
        return valueG;
    }
    public static int [][] getB(BufferedImage img) {
        //
        return valueB;
    }
    public static int [][] getA(BufferedImage img) {
        //
        return valueA;
    }
    public static int getAlpha(int rgb) {
        return (rgb >> 24) & 0xFF;
    }
    public static int getRed(int rgb) {
        return (rgb >> 16) & 0xFF;
    }
    public static int getGreen(int rgb) {
        return (rgb >> 8) & 0xFF;
    }
    public static int getBlue(int rgb) {
        return rgb & 0xFF;
    }