Saving a JPanel as an image
Hi peeps,
I've written the following code after reading many threads about how to save a JPanel as an image. On the whole, it works. But the JPanel itself contains many different bits such as Line2D objects and other shapes, as well as ImageIcons. So when the JPanel is saved, the shape objects save ok but the icons do not get saved. Does anyone know a better solution please?
By the way: "area" is the var name for a JPanel and "toSave" is a File object in the code below...
BufferedImage image = new BufferedImage(maxHorizontal, maxVertical, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
area.paint(g);
g.dispose();
ImageIO.write(image, "jpeg", toSave);
A robot wouldn't do what the OP wanted: with antialiasing, etc...
I'm still not convinced that ImageIcons don't get saved. Why does this code work:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;
public class X {
public static void main(String[] args) throws IOException {
final JPanel p = new JPanel();
p.add(new JLabel(new ImageIcon(new URL("http://today.java.net/jag/bio/JagHeadshot-small.jpg"))));
p.add(new JLabel(new ImageIcon(new URL("http://java.sun.com/placeholders/duke_swinging.gif"))));
p.add(new JLabel("etc"));
JButton save = new JButton("save");
save.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt) {
save(p, new File("junk.jpeg"));
JFrame f = new JFrame("X");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container cp = f.getContentPane();
cp.add(p);
cp.add(save, BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
static void save(Component comp, File file) {
try {
BufferedImage image = new BufferedImage(comp.getWidth(), comp.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
comp.paint(g);
g.dispose();
ImageIO.write(image, "jpeg", file);
image.flush();
} catch (IOException e) {
e.printStackTrace();
}
Similar Messages
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Saving a character displayed on JPanel as an image
Hi,
Merry christmas!
I am new to Java programming. Please englighten me with the following problem I am facing currently.
I have been trying to save a chinese character displayed on a JPanel as an image. However, what I do not understand is that when the image is saved, it only captured the JPanel (and its background) instead of the character displayed on it.
The following is my codes for this problem:
static String strUTF16 = null;
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Thanks!
ShokerIf you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
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While trying to update Motion 5.0.2 I continuously reviece this follwoing error message.
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Motion will not allow me to update.
Running Mac OS X Version 10.7.2 Lion on a MacBook Pro
Processor 2.8 GHz Intel Core 2 Duo
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Thanks.
My HD is a "normal" HD, so I guess it's HFS+. (According to Disk Utility it is Mac OS Extended (Journaled).
The NAS is WD MyBook Live Duo. I just plugged into my Time Machine.
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Ahh, thanks for the answer to question 1.
Yes, I am trying to relocate them, but tried different things to find the problem.
And the problem seems to be that when an image gets an extra attribute (when it's downloaded from the internet, when it is comes from a mail message) then Aperture seems not to be able to move the file.
I.e. Aperture presumeably asks the Finder or kernel to perform this task, and this then fails because of the extra attirbutes that were set.
I now found a way of manually removing the extra attributes, but that is a pain.
Think of this normal workflow:
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That works fine.
I looked again at the error message.
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And as long as there are no extra attributes on an image, there is no problem.
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Thanks Frank, I have to digest this a bit.
Regards
Jan -
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Hi,
I'd like to draw what is in my JPanel into a image to export it. But When I try to do that , I have problems. I put my code to be more clear:
// comp is the JPanel
comp.setDoubleBuffered(false);
JFrame frame = new JFrame();
frame.setContentPane(comp);
frame.pack();
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Image image = comp.createImage(size.width,size.height);
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g.setClip(0,0,size.width,size.height);
try
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public void run()
comp.paint(g);
catch (Exception x) { x.printStackTrace(); }
finally
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frame.dispose();
The problem is that I export into GIF this image, but if I don't show the frame:
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Vincentto diesel22
http://onesearch.sun.com/search/developers/index.jsp?col=devforums&qp=&qt=%2Bprint+%2Bshow -
Help with adding a JPanel with multiple images to a JFrame
I'm trying to make a program that reads a "maze" and displays a series of graphics depending on the character readed. The input is made from a file and the output must be placed in a JFrame from another class, but i can't get anything displayed. I have tried a lot of things, and i am a bit lost now, so i would thank any help. The input is something like this:
20
SXXXXXXXXXXXXXXXXXXX
XXXX XXXXXXXXXXX
X XXXXX
X X XX XXXXXXXXXXXX
X XXXXXXXXX XXX
X X XXXXXXXXX XXXXX
X XXXXX XXXXX XXXXX
XX XXXXX XX XXXX
XX XXXXX XXXXXXXX
XX XX XXXX XXXXXXXX
XX XX XXXXXXXX
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X XXXXXXXXXXXXX
XX XXXXXXX !
XX XXXXXX XXXXXXXXX
XX XXXXXXX XXXXXXXXX
XX XXXXXXXX
XX XXXX XXXXXXXXXXXX
XX XXXX XXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXX
Generated by the Random Maze Generator
And the code for the "translator" is this:
package project;
import java.io.*;
import java.awt.*;
import javax.swing.*;
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private FileReader Reader;
private int size;
Image wall,blank,exit,start,step1,step2;
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public Translator(File F){
try {
Reader=new FileReader(F);}
catch (IOException e){
JOptionPane.showMessageDialog(null,"Error Opening File","Error",JOptionPane.ERROR_MESSAGE);}
try {
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System.out.write(size);}
catch (IOException e){
JOptionPane.showMessageDialog(null,"Error Opening File","Error",JOptionPane.ERROR_MESSAGE);}
Toolkit theKit=Toolkit.getDefaultToolkit();
wall=theKit.getImage("wall.gif");
blank=theKit.getImage("blanktile.jpg");
exit=theKit.getImage("exit.jpg");
start=theKit.getImage("start.jpg");
step1=theKit.getImage("start.jpg");
step2=theKit.getImage("step1.jpg");
JPanel panel=new JPanel(){
public void paintComponent(Graphics g) {
super.paintComponents(g);
int ch=0;
System.out.print("a1 ");
int currentx=0;
int currenty=0;
try {ch=Reader.read();
System.out.write(ch);}
catch (IOException e){}
System.out.print("b1 ");
while(ch!=-1){
try {ch=Reader.read();}
catch (IOException e){}
System.out.write(ch);
switch (ch){
case '\n':{currenty++;
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case 'X':{System.out.print(">x<");
g.drawImage(wall,(currentx++)*20,currenty*20,this);
break;}
case ' ':{
g.drawImage(blank,(currentx++)*20,currenty*20,this);
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g.drawImage(exit,(currentx++)*20,currenty*20,this);
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g.drawImage(start,(currentx++)*20,currenty*20,this);
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}//While
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panel.setOpaque(true);
setContentPane(panel);
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i call it in another class in this way:
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firstFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Container c = getContentPane();
c.setLayout(new FlowLayout());
(...)//more constructor code here
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firstFrame.add(T);
firstFrame.getContentPane().add(c);
firstFrame.setBounds(d.width/3,d.height/3,d.width/2,d.height/4);
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thanks for any helpTry this. It's trivial to convert it to use your images.
If you insist on storing the maze in a file, just read one line at a
time into an ArrayList than convert to an array and pass that to the
MazePanel constructor.
Any questions, just ask.
import java.awt.*;
import javax.swing.*;
public class CFreman1
static class MazePanel
extends JPanel
private final static int DIM= 20;
private String[] mMaze;
public MazePanel(String[] maze) { mMaze= maze; }
public Dimension getPreferredSize() {
return new Dimension(mMaze[0].length()*DIM, mMaze.length*DIM);
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g.setColor(Color.BLACK);
g.fillRect(0, 0, getSize().width, getSize().height);
for (int y= 0; y< mMaze.length; y++) {
String row= mMaze[y];
for (int x= 0; x< row.length(); x++) {
Color color= null;
switch (row.charAt(x)) {
case 'S':
color= Color.YELLOW;
break;
case 'X':
color= Color.BLUE;
break;
case '!':
color= Color.RED;
break;
if (color != null) {
g.setColor(color);
g.fillOval(x*DIM, y*DIM, DIM, DIM);
public static void main(String[] argv)
String[] maze= {
"SXXXXXXXXXXXXXXXXXXX",
" XXXX XXXXXXXXXXX",
"X XXXXX",
"X X XX XXXXXXXXXXXX",
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"X X XXXXXXXXX XXXXX",
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"XX XXXXX XXXXXXXX",
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"XX XXXXXX XXXXXXXXX",
"XX XXXXXXX XXXXXXXXX",
"XX XXXXXXXX",
"XX XXXX XXXXXXXXXXXX",
"XX XXXX XXXXXXXXXXXX",
"XXXXXXXXXXXXXXXXXXXX"
JFrame frame= new JFrame("CFreman1");
frame.getContentPane().add(new MazePanel(maze));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
} -
Cluster not saved correctly in Append Control Image to Report VI
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~~~ Logic is a systematic method of coming to the wrong conclusion with confidence ~~~
Attachments:
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Saving a Project In Pages, Images Poor Quality in PDF
I have just purchased IWork 09, i am new to pages and so far find the software very handy and easy to use to make very attractive documents.
i have one dilemma though.
i save a (e.g.) poster in pages, but when i go to open it in PDF Preview, the images that i have inputted into the document are distorted or of a poor quality, when i open them in pages they are fine?.... also when i go 2 open the saved document in Adobe Reader 9, it wont open? i tried taking frames and shadows etc out just in case they are not supported, like in MS Word but still no luck. i have to send flyers for advertizment via e-mail to clients who are more than likely using Windows Xp or Vista.
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The right way to work is to get as much data as possible off the colour capture in high bit and do the exposure correction getting into a normalised colour space either still in high bit or in scaled down 8 bit to save space.
The pixels should be left alone from this phase and out. It is not necessary to change a single source pixel either in matching to the display, the printer or the press. All of this is done on the fly in memory and not be changing the pixels in the disk-based image document.
As interchange file format for corrected colour captures stored in the normalised colour space, either use a linearised RGB space or high-bit CIELab. The file format should be lossless TIFF and not lossy JPEG (the way JPEG works internally is lossy by definition).
Live Picture and Apple Aperture are alike in the way they work. Rather than taking the pixels into memory for correction, which is they way Photoshop worked, they construct a colour managed proxy for manipulation and then provide for a rendering that is non-destructive.
Live Picture required ColorSync 2 and Apple Aperture is unable to work without colour management for the same set of reasons. Apple Pages is unable to work without colour management for the same set of reasons, although there are additional reasons for Apple Pages.
Just my ten cents,
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Convert JPanel to buffered Image
Hi,
i have a JPanel,I override the paintComponent() method to do a lot of painting. the size of this panel is about 2500 X 2500 i want to convert it to a buffered image,
but i dont get image of total panel, but only the image of what is displayed on screen, every thing else is black, i guess becuase this is not painted,
so how do i get the total image, need help
this is my code for creating image
JFrame frame new JFrame();
frame.getContentPane().add(myPanel);
this.setSize(1000,700);
show();
int iWidth = myPanel.getPreferredSize().width;
int iHeight =myPanel.getPreferredSize().height;
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myPanel.paint(g2);
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}Ashishi use this chartPanel = new JPanel() {
public void paint(Graphics g) {
Image img = paintGraph(chartPanel.getWidth(), scroller.getViewport().getHeight());
g.drawImage(img, 0, 0, Color.white, null);
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offscreen = createImage(width, height);
offscreensize = new Dimension(width, height);
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try {
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offgraphics.setXORMode(offgraphics.getBackground());
drawSelectables(offgraphics, width, height);
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thomas -
The pdf seems to be 25mb and I saved it as a high resolution pdf. Will the quality of the psd drawing remain exactly the same??
The resolution of the linked .psd will be depend on if you scale it after placing (the Effective PPI) and your settings in the Export dialog, where you can choose to both downsample and or compress the image, or do neither.
1 GB is a pretty large image. Can you tell us more about it, and what the intended output is? I used to work with images that large on occasion for printing wall-size output, but I'm not sure you would need anything like that kind of size for poster-size and smaller. -
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Hi,
I am using a JPanel to display some primitive shapes(line, circle,etc.) and I need to save the contents of this panel to disk as an image file (JPEG, bitmap, TIFF, etc.). Have searched jdc but've found no feasible results. I would really appreciate a sample code for this job.
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fos = new FileOutputStream("c:\\majjooo.jpg");
JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(fos);
enc.encode(img);but am still having a problem is that the picture is black ...eventhough the panel has contents and i can see it but the picture has nothing but pitch black ...what do you think ?? -
Hi everyone,
First of all, I've searched for a solution to this problem throughout the forum, but somehow I never got the result I would like to have to. The problem is, I work with components (JtextArea's) that can be put on the jpanel, and images and other shapes that are drawn on the panel as well. (via the Graphics.drawImage()/drawRectangle() etc methods) All shapes and JTextArea components should be visible on the jpg file. (When I tried out some samples that I found on this forum, only one of them was visible) Can someone give me some code how I can do this, I've been looking for days now to find a solution, so I would be very grateful if someone could help me!!
Thanks in advance!!!
PlunofixHi Michael,
It worked. Thank you very much. This forum rules :-)
Regards,
Plunofix -
Image darker when saved than on-screen buffered image
Hi,
Here is my little application. I am trying to simulate an rgb screen look based on image data. ie, the new image is an exaggerated tv look of the original image.
When I try to encode/save a jpeg from my buffered image, the saved image is darker (colours also seem to be different) than what i see in my application frame. I like what I see in the JFrame and would like to have that saved. I am just an artist hack so excuse the cobbled together code. I have also included the original image, the image as it is saved, and an image as a rough approximation of the image in the JFrame.
In the code you will see I have tried different ways to encode the image (commented out)
Any ideas about this issue or how to make this program more sound please let me know.
the code:
http://zukanter.com/javaImageTest/displayImageRGBBuffer.java
the orignal loaded into the appp:
http://zukanter.com/javaImageTest/myPic.jpg
the saved image:
http://zukanter.com/javaImageTest/_003.jpeg
the image as it is in the application window:
http://zukanter.com/javaImageTest/_003Screen.jpgHi
My 2c.
I`ve had a quick look at your code and the output and I`m assuming that the vertical RGB lines are what you intended.
Jpeg works in blocks, and averages pixel valiues across them.
If introducing those primaries into the graphic and then compressing it makes it darker that`s likely the result of the primary colours being averaged by the compression algorithm.
You should look at resizing the image first, drawing it onto an offscreen buffer, then doing an overlay (alpha channel) with the primary colors instead, IMHO.
regards -
i want to save the gui i have created as an image.Taking a screen shot(print screen) is possible.But taking only the gui and saving it as image....need some help on it!
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get its graphics
paint window component to graphics
dispose graphics
(IIRC some platforms may need toolkit sync here)
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Does flattening (or saving without layers) compromise the image QUALITY?
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Flattening merges all the layers and gives it a white background, the layer is then named background and is locked. Whereas merge keeps a transparent background if there is one, the remaining layer is not locked.
A flattened image will crop any image data that falls outside the document area. So technically it does effect the quality. The same as what a crop would do.
However it does not adjust the documents image size.
A merged document leaves the image data outside the document area untouched.
That said, some formats like jpg flatten the file not merge it. As it does not support transparency nor layers. Png does not support layers therefore outer data is cropped. But tiff and psd will keep outer data as both of these formats support transparency and layers. Transparency is required to stop the file from being flattened and layers is required to keep any image data that falls outside the document area from being cropped.
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