I am trying to load an image from directory and place it as an icon in JLabel. But when the image size is big it doesn't fit completely in the label. I tried resizing the image to fit in the label but its not working. May I know where I am going wrong?
JFileChooser choose=new JFileChooser();
choose.showOpenDialog(null);
File f=choose.getSelectedFile();
String filename=f.getAbsolutePath();
path.setText(filename);
ImageIcon icon=new ImageIcon(filename);
Image img=icon.getImage();
BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics g = bi.createGraphics();
g.drawImage(img,500, 500, null);
ImageIcon newIcon = new ImageIcon(bi);
image_label.setIcon(newIcon);
BufferedImage img = ImageIO.read(...);
Image scaled = img.getScaledInstance(500, 500, Image.SCALE_SMOOTH);
ImageIcon icon = new ImageIcon(scaled);
Beware, that this will scale the image so that it is square. Take a look at Java: maintaining aspect ratio of JPanel background image which discusses maintaining the aspect ratio of the image when scaled.
Also, you should read The Perils of Image.getScaledInstance() and have a look at Scale the ImageIcon automatically to label size which uses a divide and conqure scaling algorithim and Quality of Image after resize very low -- Java which demonstrates the issues of doing a one step scale...
Related
I am trying to convert a JPanel to Image and will be writing it to a PDF using iText.
I have searched ways on how to convert JPanel to Image and found two "Working" solutions.
private BufferedImage createImage(JPanel panel) {
int w = panel.getWidth();
int h = panel.getHeight();
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
panel.print(g);
return bi;
}
public static java.awt.Image getImageFromPanel(JPanel component) {
BufferedImage image = new BufferedImage(component.getWidth(),
component.getHeight(), BufferedImage.TYPE_INT_ARGB);
component.paint(image.getGraphics());
return image;
}
As you can see, I already used "ARGB" to try to convert it to image with a transparent or white background but it doesnt work. See attached image.
Is there a way to convert it to image and print it to PDF with white or transparent background?
Below is the image converted from the JPanel using codes above
Image written on PDF
Bottom is the JPanel I want to convert to Image
JPanel I want to convert
Is there a way to convert it to image and print it to PDF with white or transparent background?
Well by default a JPanel is opaque and has its own background so the background get copied to the image.
I have never tried this before but maybe nesting panels something like this will work:
JPanel imagePanel = new JPanel();
imagePanel.setOpaque(false);
JPanel backgroundPanel = new JPanel( new BorderLayout() );
backgroundPanel.add( imagePanel );
frame.add( backgroundPanel );
So now the imagePanel should be be transparent when you create the BufferedImage. But it will inherit the background color of the backgroundPanel so it still looks correct in the frame.
I think the easiest way is to fit the Panel size to the inside components, then the components may cover all the Panel background
I use OpenImaj for a project and I need to display the video in 800*600 to a panel but I must capture images at 1920,1080 when I click a button.
My strategy was initially to capture from my webcam at 1920,1080 and to resize image in a icon of a label contained in my panelVideo.
My problem is that the performance is very low.
Is there an efficient method to resize video according to the size of panelVideo without changing the frame size (that I use for saving the image at 1920,1080)?
Thank you for your answer.
Regards.
final VideoCapture vc = new VideoCapture(1920,1080);
vc.setFPS(10);
final VideoDisplay<MBFImage> display = VideoDisplay.createVideoDisplay(vc, panelVideo);
display.addVideoListener(new VideoDisplayAdapter<MBFImage>()
{
#Override
public void beforeUpdate(final MBFImage frame)
{
//here I create a bufferedImage from the resized frame
BufferedImage img = new BufferedImage(800, 600, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) img.getGraphics();
g.drawImage(ImageUtilities.createBufferedImageForDisplay(frame), 0, 0, 800, 600, null);
//here is the label that I use to display the video
labelVideo.setIcon(new ImageIcon(ImageUtilities.createBufferedImageForDisplay(frame)));
}
});
You can at least remove fixed code like this out of the loop - that is create it only once
//here I create a bufferedImage from the resized frame
BufferedImage img = new BufferedImage(800, 600, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) img.getGraphics();
and also have the Icon created once and setImage() as needed. Beyond that I dont know how to convert MBF to BufferedImage thats the pain of using different libraries. g.drawImage() is a good way to draw the scaled image.
See http://openimaj.org/apidocs/org/openimaj/image/processing/resize/package-frame.html for the OpenIMAJ classes that let you resize an MBFImage. You'll have to play and see what is fastest, but in my very quick experiments I found BilinearInterpolation to be better than ResizeProcessor with the default options, however using a different filter in ResizeProcessor might be faster.
Rather than creating a new BufferedImage each frame, you would probably be better off drawing the MBFImage into a Swing component that displays them directly: http://openimaj.org/apidocs/org/openimaj/image/DisplayUtilities.ScalingImageComponent.html or http://openimaj.org/apidocs/org/openimaj/image/DisplayUtilities.ImageComponent.html (note that technically these both convert to BufferedImage behind the scenes, but they only allocate the image once and just redraw into it saving a lot of time).
I am trying to read a PNG image file from disk, draw some rectangles on it and save the modified image on the disk. Here's the scala code:
//l is a list of Rectangle objects of the form (x1,x2,y1,y2)
val image = ImageIO.read(sourceimage);
val graph=image.createGraphics()
graph.setColor(Color.GREEN)
l.foreach(x=>graph.draw(new java.awt.Rectangle(x.x1,x.y1,x.x2-x.x1,x.y2-x.y1)))
graph.dispose()
ImageIO.write(image,"png",new File(destimage))
The rectangles are drawn but in GREY color instead of GREEN. What am I doing wrong?
If the source image is a gray scale image, then it's unlikely that it will be capable of using any color of any sort.
Instead, you need to create a second, colored, BufferedImage and paint the original to it.
BufferedImage original = ImageIO.read(sourceimage);
BufferedImage iamge = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = image.createGraphics();
g2d.drawImage(original, 0, 0, null);
// Continue with what you have
Sorry, I have no experience with PIL, but that's how you'd do it (basically) in pure Java
I want to make rectangles on a JLabel and the convert that rectangle into a BufferedImage... like layers in paint shop... drage that BufferedImage and resize...can anyone help
I have done this but it didnt work
Rectangle2D rectangle2D;
BufferedImage bi = new BufferedImage(bimg.getWidth(), bimg.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D big = bi.createGraphics();
rectangle2D = new Rectangle2D.Float(eX, eY, sW, sH);
big.setStroke(new BasicStroke(5));
big.setColor(color);
shapePaint = new TexturePaint(bi, rectangle2D);
g2d.setPaint(shapePaint);
I want to make rectangles on a JLabel and the convert that rectangle into a BufferedImage
You are doing it the wrong way around. Draw to the buffered image, add it to a label, call label.repaint() to display any changes.
E.G.
As seen in..
This answer
This answer
This answer or..
..For an animated version, this answer
I want to use java JLabel with an Icon in custom size on my GUI. like this :
I used this code to change size of original Icon :
ImageIcon imageIcon = (ImageIcon) jLabel1.getIcon();// new ImageIcon( "Play-Hot-icon.png");
ImageIcon thumbnailIcon = new ImageIcon(getScaledImage(imageIcon.getImage(), 25 , 25));
jLabel1.setIcon(thumbnailIcon);
and here is code for resize image
private Image getScaledImage(Image srcImg, int w, int h){
BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = resizedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(srcImg, 0, 0, w, h, null);
g2.dispose();
return resizedImg;
}
but after resizing image and using this code the result is this! :
how can I have desired image on my JLabel??
regards,
sajad
The problem is that when you create the scaled image, you use BufferedImage.TYPE_INT_RGB for your new image, and transparency gets rendered as black with just TYPE_INT_RGB.
In order to keep transparency, you need to replace that with BufferedImage.TYPE_INT_ARGB, since you need an alpha component.
However, calling Image.getScaledInstance on imageIcon's image will return a scaled image, already with an alpha component, and you can pass it rendering hints to play with the quality of the scaled image, doing essentially the same as your getScaledImage function, but with less of the hassle.