Java Utililty Methods BufferedImage Operation

List of utility methods to do BufferedImage Operation

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Description

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

Method

intnrChannels(BufferedImage img)
nr Channels 
switch (img.getType()) {
case BufferedImage.TYPE_3BYTE_BGR:
    return 3;
case BufferedImage.TYPE_4BYTE_ABGR:
    return 4;
case BufferedImage.TYPE_BYTE_GRAY:
    return 1;
case BufferedImage.TYPE_INT_BGR:
...
intnumPixelsDifferent(BufferedImage imgA, BufferedImage imgB)
num Pixels Different 
int height = Math.min(imgA.getHeight(), imgB.getHeight());
int width = Math.min(imgA.getWidth(), imgB.getWidth());
int n = imgA.getWidth() * imgA.getHeight() + imgB.getWidth() * imgB.getHeight() - 2 * width * height;
for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
        if (imgA.getRGB(x, y) != imgB.getRGB(x, y)) {
            n += 1;
return n;
BufferedImageoffset(final BufferedImage image, final float[] scales, final float[] offsets)
Performs a rescale operation on the image's color components. 
return new RescaleOp(scales, offsets, null).filter(image, null);
voidopen(BufferedImage image)
Writes image to disk and opens in default editor 
File file = File.createTempFile("gscrot", ".png");
ImageIO.write(image, "png", file);
Desktop.getDesktop().open(file);
BufferedImageopenAsBufferedImage(String path)
Open as buffered image. 
BufferedImage I = null;
try {
    I = ImageIO.read(new File(path));
} catch (IOException e) {
    e.printStackTrace();
return I;
BufferedImageoperatedImage(BufferedImage source, BufferedImageOp op)
Applies a BufferedImageOp on the given BufferedImage . 
BufferedImage newImage = newArgbBufferedImage(source.getWidth(), source.getHeight());
Graphics2D g = (Graphics2D) newImage.getGraphics();
g.drawImage(source, op, 0, 0);
return newImage;
BufferedImageoptimizeForGraphicsHardware(BufferedImage image)
Converts an image to an optimized version for the default screen.
The optimized image should draw faster. 
try {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gd.getDefaultConfiguration();
    int w = image.getWidth();
    int h = image.getHeight();
    BufferedImage optimized = gc.createCompatibleImage(w, h);
    optimized.getGraphics().drawImage(image, 0, 0, null);
...
BufferedImageoptimizeForGraphicsHardwareIfRequired(BufferedImage image)
Converts an image to an optimized version for the default screen.
The optimized image should draw faster. 
try {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gd.getDefaultConfiguration();
    if (image.getColorModel().equals(gc.getColorModel())) {
        return image;
    int w = image.getWidth();
...
BufferedImageoptimizeImage(BufferedImage image)
Optimize an image or create a copy of an image if the image was created by getBufferedImage() 
GraphicsConfiguration gfx_config = GraphicsEnvironment.getLocalGraphicsEnvironment()
        .getDefaultScreenDevice().getDefaultConfiguration();
if (image.getColorModel().equals(gfx_config.getColorModel())) {
    return image;
BufferedImage new_image = gfx_config.createCompatibleImage(image.getWidth(), image.getHeight(),
        image.getTransparency());
Graphics2D g2d = (Graphics2D) new_image.getGraphics();
...
intotsuTreshold(BufferedImage original)
otsu Treshold 
int[] histogram = imageHistogram(original);
int total = original.getHeight() * original.getWidth();
float sum = 0;
for (int i = 0; i < 256; i++) {
    sum += i * histogram[i];
float sumB = 0;
int wB = 0;
...