'OutOfMemoryError' question. thanks

Question

hey guys,
i'm using the NetBean 4.1 to write a simple program, which can load an image and modify it to be green scale image. i want to display the green scale image in original size (display in scrollpane) and on-screen size (resize the image and display in a JLabel ).
my problem is that i only can display the green scale image in either original size or on-screen size. otherwise, the "OutOfMemoryError: Java heap space" appeared.
i am wondering there is any way i can remove the image from the memory when i close original size image window / on-screen size image window?
here is part of my code:
=====================================================
//display the original size of greenscale image
int gsArawWidth;
int gsArawHeight;
// 'image' is the image has been loaded
gsArawWidth = image.getWidth(null);
gsArawHeight = image.getHeight(null);
gsApix = new int[gsArawWidth * gsArawHeight];
try {
PixelGrabber gsApgObj = new PixelGrabber (
image, 0, 0, gsArawWidth, gsArawHeight, gsApix, 0,
gsArawWidth);
if (gsApgObj.grabPixels() && (gsApgObj.getStatus() &
ImageObserver.ALLBITS) != 0) {
for(int cnt = 0; cnt < (gsArawWidth * gsArawHeight); cnt ++) {
gsApix[cnt] = gsApix[cnt] & 0xFF00FF00;
} catch(InterruptedException e) { System.out.println(e);
gsAmodImage = this.createImage(new MemoryImageSource(
gsArawWidth, gsArawHeight, gsApix, 0, gsArawWidth));
JFrame gsAframe = new JFrame("Original size of greenscale image");
gsAframe.setDefaultCloseOperation(gsAframe.DISPOSE_ON_CLOSE);
Icon gsAicon = new ImageIcon(gsAmodImage);
JLabel gsAScrollLabel = new JLabel(gsAicon);
JScrollPane gsAscrollPane = new JScrollPane();
gsAscrollPane.setViewportView(gsAScrollLabel);
gsAframe.getContentPane().add(gsAscrollPane, BorderLayout.CENTER);
gsAframe.setSize(705, 553); //set new window's size
gsAframe.setLocation(0,100); //set new window's location
gsAframe.setVisible(true);
//display the resized greenscale image
int gsBrawWidth;
int gsBrawHeight;
gsBrawWidth = image.getWidth(null);
gsBrawHeight = image.getHeight(null);
gsBpix = new int[gsBrawWidth * gsBrawHeight];
try {
PixelGrabber gsBpgObj = new PixelGrabber (
image, 0, 0, gsBrawWidth, gsBrawHeight, gsBpix, 0, gsBrawWidth);
//make sure the image has been loaded fully
if (gsBpgObj.grabPixels() && (gsBpgObj.getStatus() &
ImageObserver.ALLBITS) != 0) {
for(int cnt = 0; cnt < (gsBrawWidth * gsBrawHeight); cnt ++) {
gsBpix[cnt] = gsBpix[cnt] & 0xFF00FF00;
} catch(InterruptedException e) { System.out.println(e);
gsBmodImage = this.createImage(new MemoryImageSource(
gsBrawWidth, gsBrawHeight, gsBpix, 0, gsBrawWidth));
int gsBmaxEdge = 600;
double gsBscale = (double) gsBmaxEdge / (double) gsBmodImage.getWidth(null);
if (gsBmodImage.getWidth(null) < gsBmodImage.getHeight(null)) {
gsBscale = (double) gsBmaxEdge / (double) gsBmodImage.getHeight(null);
int gsBscaledW = (int) (gsBscale * gsBmodImage.getWidth(null));
int gsBscaledH = (int) (gsBscale * gsBmodImage.getHeight(null));
gsBnewimage = gsBmodImage.getScaledInstance(gsBscaledW ,
gsBscaledH, Image.SCALE_SMOOTH);
JFrame gsBframe = new JFrame("resized greenscale image");
gsBframe.setDefaultCloseOperation(gsBframe.DISPOSE_ON_CLOSE);
Icon gsBicon = new ImageIcon(gsBnewimage);
JLabel gsBLabel = new JLabel(gsBicon);
gsBframe.getContentPane().add(gsBLabel, BorderLayout.CENTER);
gsBframe.setSize(705, 553); //set new window's size
gsBframe.setLocation(0,100); //set new window's location
gsBframe.setVisible(true);
====================================================
thanks heaps
cooper

Answer 1

by the way, i have increased the jvm's heap size:
netbeans_default_options="-J-Xms256m -J-Xmx512m -J-XX:PermSize=256m -J-XX:MaxPermSize=256m -J-Xverify:none"