java how to convert a int[][] to an BufferedImage -

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i have 2d integer array, bufferedimage method "getrgb()". when try convert 2d integer array bufferdimage, black picture.

this method 

bufferedimage bufferedimage = new bufferedimage(width, height, bufferedimage.type_int_rgb);     (int = 0; < matrix.length; i++) {         (int j = 0; j < matrix[0].length; j++) {             int pixel=matrix[i][j];             system.out.println("the pixel in matrix: "+pixel);             bufferedimage.setrgb(i, j, pixel);             system.out.println("the pixel in bufferedimage: "+bufferedimage.getrgb(i, j));         }     }

give output:

the pixel in matrix: 0 pixel in bufferedimage: -16777216 pixel in matrix: 721420288 pixel in bufferedimage: -16777216 pixel in matrix: 738197504 pixel in bufferedimage: -16777216 pixel in matrix: 520093696 pixel in bufferedimage: -16777216 pixel in matrix: 503316480 pixel in bufferedimage: -16777216

why every pixel "-16777216"?

thanks!

update

the method returns integer matrix

public int[][] getmatrixofimage(bufferedimage bufferedimage) {     int width = bufferedimage.getwidth(null);     int height = bufferedimage.getheight(null);     int[][] pixels = new int[width][height];     (int = 0; < width; i++) {         (int j = 0; j < height; j++) {             pixels[i][j] = bufferedimage.getrgb(i, j);         }     }      return pixels; }

all pixels seem black different alpha values. have use type_int_argb not lose alpha channel.


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