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

BufferedImagegradientMask(BufferedImage img, float start, float stop)
Draws linear alpha mask on source image. 
BufferedImage result = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = result.createGraphics();
g2.drawImage(img, 0, 0, null);
GradientPaint paint = new GradientPaint(0, img.getHeight(), new Color(1.0f, 1.0f, 1.0f, start), 0, 0,
        new Color(1.0f, 1.0f, 1.0f, stop), false); 
g2.setComposite(AlphaComposite.DstIn);
g2.setPaint(paint);
g2.fillRect(0, 0, img.getWidth(), img.getHeight());
...
BufferedImagegreyScale(BufferedImage image)
turns a Buffered Image greyscale 
BufferedImage gs = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g2 = (Graphics2D) gs.getGraphics();
g2.drawImage(image, 0, 0, null);
g2.dispose();
return gs;
voidgrid(BufferedImage image, int between)
grid 
Graphics g = image.getGraphics();
g.setColor(Color.gray.brighter());
for (int x = 0; x < image.getWidth(); x += between) {
    g.drawRect(x, 0, 0, image.getHeight());
for (int y = 0; y < image.getHeight(); y += between) {
    g.drawRect(0, y, image.getWidth(), 0);
doubleheight(BufferedImage image, Double measurementLatitude, Double measurementLongitude)
This function converts a measurementLatitude, measurementLongitude into a pixel co-ordinate and reads the associated pixel and returns the red value of the pixel - representing height - 0 is low, 255 is high 
int w = image.getWidth();
int h = image.getHeight();
int zeroLat = h / 2;
int zeroLong = w / 2;
Double degreeXPerPixel = (double) w / 360;
Double degreeYPerPixel = (double) h / 180;
int y = zeroLat + ((int) Math.round(measurementLatitude * degreeYPerPixel * -1));
int x = zeroLong + ((int) Math.round(measurementLongitude * degreeXPerPixel));
...
BufferedImagehighlight(BufferedImage img, Color source, Color dest)
Turn the BufferedImage instance color components from source to destination for highlighting. 
img = deepCopy(img);
short[] r = new short[256];
short[] g = new short[256];
short[] b = new short[256];
short[] a = new short[256];
for (int i = 0; i < 256; i++) {
    r[i] = (short) i;
    g[i] = (short) i;
...
booleanhitTest(BufferedImage image, int x, int y)
Returns true if the supplied image contains a non-transparent pixel at the specified coordinates, false otherwise. 
int argb = image.getRGB(x, y);
return (argb >> 24) != 0;
BufferedImagehueShift(BufferedImage image, int hue)
changes the hue of image. 
BufferedImage result = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
float ihue = hue / 360.0f;
for (int y = 0; y < image.getHeight(); y++) {
    for (int x = 0; x < image.getWidth(); x++) {
        int RGB = image.getRGB(x, y);
        int R = (RGB >> 16) & 0xff;
        int G = (RGB >> 8) & 0xff;
        int B = (RGB) & 0xff;
...
floatinColormap(float[][] in, float min, float max, float[][] colormap, BufferedImage b)
in Colormap 
int width = in[0].length;
int height = in.length;
int cvals = colormap.length;
float[] bData = ((DataBufferFloat) b.getRaster().getDataBuffer()).getData();
for (int yy = 0; yy < height; yy++) {
    for (int xx = 0; xx < width; xx++) {
        int cmapIdx = (int) (cvals * (in[yy][xx] - min) / max);
        bData[yy * width + xx] = colormap[cmapIdx][0];
...
BufferedImageindexToDirectColorModel(BufferedImage image)
index To Direct Color Model 
BufferedImage result = new BufferedImage(image.getWidth(), image.getHeight(),
        BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2 = result.createGraphics();
g2.drawImage(image, null, null);
return result;
voidintBuffer2BufferedImage(IntBuffer ib, BufferedImage img)
Convert IntBuffer to BufferedImage. 
int[] rgbArray = new int[ib.capacity()];
ib.rewind();
ib.get(rgbArray);
img.setRGB(0, 0, img.getWidth(), img.getHeight(), rgbArray, 0, img.getWidth());