Re: Photo album
Zé Vicente schrieb: 1. The user chooses to upload a photo which its size is 5Mb. I am sure that 5Mb is to big to display it afterwords. Not necessarily, you can offer it as special download in addition to a picture with smaller resolution. How can I resize it without loosing the quality? There are a couple of libraries out there allowing to manipulate images. Java 2D, JAI are pure Java implementations, you can also use ImageMagick by calling the binaries with Runtime.exec or use the JNI-wrapper (I stopped that because it was adding complexity and crashes). Shrinking pictures still look quite good, even if you do that automatically. You would have more problems when magnifying them. 2. Then I need to show thumbnails of this photo. What should I do? Thumbnails are different photos with smaller size or the same photo with different width and height? You should create smaller pictures, because the result will look the same on the browser (that would need to do the resizing itself) and you save a lot of bandwith and loading time. I would appreciate if you can give me links regarding this subject or any examples. Just look up the names a was giving above in the search engine of your choice. The only ressources I have here are books, so I can't provide you links that you wouldn't find for yourself with above method. More questions about that are in my eyes better asked in comp.lang.java.help or comp.lang.java.programmer Regards, Lothar --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en -~--~~~~--~~--~--~---
Re: Photo album
hi On Aug 25, 1:22 pm, Zé Vicente josevicentec...@gmail.com wrote: Hello all, This question is not 100% GWT oriented, but I need your help and experience regarding photo album applications. perhaps u can try smartgwt it a gwt wrapper around smartclient js libraries Its takes a while (around 2-10 sec based on your connection) to load the initial js libraries, but once loaded its quiet faster http://www.smartclient.com/smartgwt/showcase/#featured_tile_filtering - sree --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en -~--~~~~--~~--~--~---
Re: Photo album
This is a simple example to resize and change the format of an image in the
server side.
I hope it helps you
Manolo Carrasco
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class ImageManipulator {
public static void main(String[] args) throws IOException {
transform(image.jpg, image.png, 100, 100, png);
}
public static void transform(String fileOrig, String fileFinal, int width,
int height, String format) throws IOException {
File file = new File(fileOrig);
BufferedImage buffImgOrig = ImageIO.read(file);
ImageIcon thumb = new ImageIcon(buffImgOrig.getScaledInstance(width,
height, Image.SCALE_SMOOTH));
BufferedImage buffImgFinal = new BufferedImage(thumb.getIconWidth(),
thumb.getIconHeight(), BufferedImage.TYPE_INT_RGB);
Graphics g = buffImgFinal.getGraphics();
g.drawImage(thumb.getImage(), 0, 0, null);
File outputfile = new File(fileFinal);
ImageIO.write(buffImgFinal, format, outputfile);
}
}
2009/8/25 (श्री) GNU Yoga gnuy...@gmail.com
hi
On Aug 25, 1:22 pm, Zé Vicente josevicentec...@gmail.com wrote:
Hello all,
This question is not 100% GWT oriented, but I need your help and
experience regarding photo album applications.
perhaps u can try smartgwt it a gwt wrapper around smartclient js
libraries
Its takes a while (around 2-10 sec based on your connection) to load
the initial js libraries, but once loaded its quiet faster
http://www.smartclient.com/smartgwt/showcase/#featured_tile_filtering
- sree
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To post to this group, send email to google-web-toolkit@googlegroups.com
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en
-~--~~~~--~~--~--~---
Re: Photo album
something I do, is to use a Java-Applet that rescales the users images
on the client side.
pros:
* rescaling is done on the client side: so you only transfer the
smaller rescaled version
* but if you also want thumbnails you have to compute them on the
server again
* the applet offers convenient functions to choose/display the images
* the user can even rotate the pics before uploading
* or drag/drop the files from the windows-explorer to the applet
cons:
* if java is deactivated or not present, you have to offer a plain
html upload as alternative
* the you need the resize logic on the server anyway
* rescaling is done on the client side: this also means that the
client has to do more work - needs memory and cpu
* GWT-to-Applet communication is everything but easy
* you should sign the applet to get rid of security warnings
http://jupload.sourceforge.net/applet-basic-picture.html
this is open source, so you could browse it to see how they rescale
your pic
other alternative would be to use e.g. flash
On Aug 25, 4:47 pm, Manuel Carrasco Moñino
manuel.carrasc...@gmail.com wrote:
This is a simple example to resize and change the format of an image in the
server side.
I hope it helps you
Manolo Carrasco
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class ImageManipulator {
public static void main(String[] args) throws IOException {
transform(image.jpg, image.png, 100, 100, png);
}
public static void transform(String fileOrig, String fileFinal, int width,
int height, String format) throws IOException {
File file = new File(fileOrig);
BufferedImage buffImgOrig = ImageIO.read(file);
ImageIcon thumb = new ImageIcon(buffImgOrig.getScaledInstance(width,
height, Image.SCALE_SMOOTH));
BufferedImage buffImgFinal = new BufferedImage(thumb.getIconWidth(),
thumb.getIconHeight(), BufferedImage.TYPE_INT_RGB);
Graphics g = buffImgFinal.getGraphics();
g.drawImage(thumb.getImage(), 0, 0, null);
File outputfile = new File(fileFinal);
ImageIO.write(buffImgFinal, format, outputfile);
}
}
2009/8/25 (श्री) GNU Yoga gnuy...@gmail.com
hi
On Aug 25, 1:22 pm, Zé Vicente josevicentec...@gmail.com wrote:
Hello all,
This question is not 100% GWT oriented, but I need your help and
experience regarding photo album applications.
perhaps u can try smartgwt it a gwt wrapper around smartclient js
libraries
Its takes a while (around 2-10 sec based on your connection) to load
the initial js libraries, but once loaded its quiet faster
http://www.smartclient.com/smartgwt/showcase/#featured_tile_filtering
- sree
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To post to this group, send email to google-web-toolkit@googlegroups.com
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en
-~--~~~~--~~--~--~---
