Picking a color of a JPEG image

Hi!
Can anyone please help me with this issue:
I'm writing a program that has to *"pick a color" of a 640 x 480px JPEG image*. The arguments of the program are the X and Y coordinates from the top left corner - than the program outputs the color in the hexadecimal notation.
Kind regards

Nope not a homework problem ... I have a GUI program (some input fields and a simple display) that downloads some specific measurement pictures (colour graphs) from a daily refreshed site and it archives them in a specific order. The output of the program is a HTML file that resembles a specific measurement based on the colour of a specific pixel on these pictures.
I have everything in place ... just this colour picking of an image poses a halt for me.
That's why I was hoping to get a usage example of the method that you specified.
Edited by: Serpentinsek on Sep 24, 2008 10:48 AM

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import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;
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The loading process It takes about 10 seconds, and every repaint it takes the same time.The painting yes, the loading no. It shouldn't take much more time to load the image then an ordinary JPEG. In particular, your now using a "natively accelerated" JPEG image reader, so it should take less time on average to load any JPEG. 10 seconds is absurd. Are you sure your not including the drawing time in that figure?
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                 byte0[x][y] = byte0[x][y] / numFrames;
                if((byte0[x][y])<10)
                         t0= "0" + byte0[x][y].toString();
                //else if((byte0[x][y])>=10 & ((byte0[x][y])<100))
                //    t0 = "0" + byte0[x][y].toString();
                else
                    t0 = byte0[x][y].toString();
                byte1[x][y] = byte1[x][y] / numFrames;
                if((byte1[x][y])<10)
                         t1= "0" + byte1[x][y].toString();
                //else if((byte1[x][y])>=10 & ((byte1[x][y])<100))
                //    t1= "0" + byte1[x][y].toString();
                else
                    t1 = byte1[x][y].toString();
                byte2[x][y] = byte2[x][y] / numFrames;
                if((byte2[x][y])<10)
                         t2= "0" + byte2[x][y].toString();
                //else if((byte2[x][y])>=10 & ((byte2[x][y])<100))
                //    t2 = "0" + byte2[x][y].toString();
                else
                    t2 = byte2[x][y].toString();
                byte3[x][y] = byte3[x][y] / numFrames;
                if((byte1[x][y])<10)
                    t3="0" + byte3[x][y].toString();
                else
                    t3 = byte3[x][y].toString();
                    pixels[x][y] = (pixels[x][y]/numFrames) * 16581375;
                try{
                    String rgbs = t2+t1+t0;
                    Integer rgb = Integer.valueOf(rgbs);
                          //System.out.println("Valor do rgb: " +rgb);
                    mean.setRGB(x,y,(int)pixels[x][y]);
                }catch(NumberFormatException nfe){
                    System.out.println("ERROR: Integer to STRING: " + nfe);
                    return false;
                }// end of catch

It�s ok, I�ve already found the solution.
Thanks.

Jpeg image loaded with Loader- loadBytes() does not display when app is deployed on remote server

I am loading a JPEG image from the server, using the Loader->loadBytes() and that works when the app is deployed under my local Tomcat server. When I deploy it on other servers the image is not displayed, instead of the image I see II*
On the server side I have java, Spring, BlazeDs and I use RemoteObject on the client.
The code that loads the image looks like below:
private function imageLoadResultHandler(event:ResultEvent):void {
    var result:ArrayCollection = event.result as ArrayCollection
    var bytes : ByteArray = result.getItemAt(0) as ByteArray;
    _loader = new Loader();
    _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
    _loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loaderFaultHandler);
    _loader.loadBytes(bytes);
private function loaderCompleteHandler(event:Event):void {
    var loaderInfo:LoaderInfo = event.currentTarget as LoaderInfo;
    var img:Image = new Image();
    img.source = loaderInfo.content;
    myPanel.addChild(img);
<mx:RemoteObject id="ro" destination="imageLoadService">
     <mx:method name="loadImage" result="imageLoadResultHandler(event)" fault="faultHandler(event)" />
</mx:RemoteObject>
Any help with this problem is much appreciated.
Thank you,
Lumi Velicanu

Hi Dmitri,
Thank you for the prompt reply, your question about the jpeg content was a helpful pointer.
I solved the problem, it had nothing to do with flex, it was all on the java side. The image was obtained from converting a TIFF to a JPEG, the conversion was failing and the flex loader was receiveing a tiff and it did not know how to display it.
The java problem was kind of interesting, I'll post it here as an FYI in case anybody cares :
On my server the first writer returned by ImageIO was an instance of JPEGImageWriter and on the other servers was CLibJPEGImageWriter. And it happens that only JPEGImageWrite can write the type of TIFF that we are having.
The fix was to iterate through all the writers and pick the instace of JPEGImageWrite, instead of the first one found.
Lumi

Playing a series of jpeg images on Firefox (like a video)

We are having a problem playing a series of jpeg images on Firefox (like a video). It works perfectly on IE, Chrome and Safari.
Here you can see a demonstration of the problem: [http://www.youtube.com/watch?v=8tG0zuoMbLM http://www.youtube.com/watch?v=8tG0zuoMbLM]
Our code just loads one Jpeg after another. For some reason this causes Flickering with FF.
'''How to replicate the problem on our website'''
You can observe the problem by actually visiting our website. Please follow the link below (use firefox):
http://www.camba.tv/CameraView.aspx?c=fudraste
On this page select “Recorded Images” tab and then click “Play” below the image. Please increase play speed by clicking button with”>>” symbol. Once the images are playing you will notice a flicker in Firefox but the same page will not show flickering in Safari or chrome.

Export to QuickTime Conversion. In format set Image Sequence. In Options pick the format, TIFF would be better than JPEG, which a lossy format. Make folder. Save the images. Process in Photoshop or whatever. Import the images set to one frame or use QT Pro to convert it back to a movie.

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