Java Utililty Methods BufferedImage to RGB

List of utility methods to do BufferedImage to RGB

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Description

The list of methods to do BufferedImage to RGB are organized into topic(s).

Method

int[]getRGB(BufferedImage image, int x, int y, int width, int height, int[] pixels)
A convenience method for getting ARGB pixels from an image. 
int type = image.getType();
if (type == BufferedImage.TYPE_INT_ARGB || type == BufferedImage.TYPE_INT_RGB)
    return (int[]) image.getRaster().getDataElements(x, y, width, height, pixels);
return image.getRGB(x, y, width, height, pixels, 0, width);
int[]getRGB(BufferedImage img)
get RGB 
int[] rgb = new int[img.getWidth() * img.getHeight()];
img.getRGB(0, 0, img.getWidth(), img.getHeight(), rgb, 0, img.getWidth());
return rgb;
ListgetRgbFromImage(BufferedImage image)
Get RGB data array from given image 
List<int[][]> rgb = new ArrayList<int[][]>();
int[][] r = null;
int[][] g = null;
int[][] b = null;
int width = 0;
int height = 0;
width = image.getWidth();
height = image.getHeight();
...
int[][]getRGBPixels(BufferedImage img)
Returns all the pixels of the image as an int array (row-wise) with the RGB(A) components as second dimension. 
int[][] result;
int y;
int x;
int i;
int pixel;
result = new int[img.getWidth() * img.getHeight()][4];
i = 0;
for (y = 0; y < img.getHeight(); y++) {
...
int[][]imageToMatrix(BufferedImage image)
image To Matrix 
int w = image.getWidth();
int h = image.getHeight();
int[][] imageMatrix = new int[w][h];
for (int i = 0; i < w; i++) {
    for (int j = 0; j < h; j++) {
        imageMatrix[i][j] = image.getRGB(i, j);
return imageMatrix;
int[][]imageToPixels(BufferedImage image)
image To Pixels 
if (image == null) {
    return null;
int w = image.getWidth();
int h = image.getHeight();
int[][] pixels = new int[w][h];
Raster raster = image.getRaster();
if (raster.getTransferType() == DataBuffer.TYPE_BYTE) {
...
ByteBufferimageToRGBABuffer(BufferedImage img)
image To RGBA Buffer 
ByteBuffer buf = null;
buf = ByteBuffer.allocateDirect(4 * img.getWidth() * img.getHeight());
byte[] pixels = ((DataBufferByte) img.getRaster().getDataBuffer()).getData();
boolean hasAlpha = img.getAlphaRaster() != null;
for (int pixel = 0; pixel < pixels.length; pixel += (hasAlpha ? 4 : 3)) {
    int offset = hasAlpha ? 1 : 0;
    buf.put(pixels[pixel + 2 + offset]);
    buf.put(pixels[pixel + 1 + offset]);
...
BufferedImageimageToRgbaBufferedImage(final Image image)
Convert Image to BufferedImage. 
final BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null),
        BufferedImage.TYPE_4BYTE_ABGR);
final Graphics2D g2 = bufferedImage.createGraphics();
g2.drawImage(image, 0, 0, null);
g2.dispose();
return bufferedImage;