Change quality of JPEG byte array

I have a JPEG file which I read into a byte array in my program, the problem is that I need to change the quality of this image, is it possible? If so, how?

i think these two links could help you:
[JAI cookbook|http://www.lac.inpe.br/~rafael.santos/JIPCookbook/6040-howto-compressimages.jsp]
[java.sun.com|http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Encode.doc.html#51423]

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Display jpeg byte array with JSP !!

I am new in JSP area so maybe I ask a easy question !!
First, on the server side:I use a C++ program to stream sequence jpeg data out(FF D8 ~ FF D9).
Second, on the client side:I use jsp to open a socket and read
data to a byte array.
Can anyone tell me how to display the jpeg array on browser one by one ?

um... like video frames, or just a single image? I wouldn't really use JSP for that, I'd use a servlet, set the content-type to image/jpeg and just write out the bytes. Unless you are talking about displaying the bytes themselves, in which case, a JSP page would be better. If it's video frames, I'm not sure how to have the browser do that, since most no longer support server push.

How to change the image into byte and byte array into image

now i am developing one project. i want change the image into byte array and then byte array into image.

FileInputStream is = new FileInputStream(file);
byte[] result = IOUtils.toByteArray(is);
with apache common IO lib

Display byte array of jpeg in jsp

I have a byte array of jpeg image in my jsp. Now I want to display it in my image. I tried but i could not see the image but a red mark image is comming on the screeen
Please help me out. I deadly help need ASAP. Thanks in advance.
this is how i tried
response.setContentType("image/jpeg");
ServletOutputStream os = response.getOutputStream();
// i get byte array from loDocumentDVO.getFileContents():
byte[] fileContent = loDocumentDVO.getFileContents();
os.write(fileContent);
os.flush();

Thank you for your sharp words.
I have now compiled the ImageServlet I have adapted slightly from http://balusc.xs4all.nl/srv/dev-jep-img.html
I am trying to run it with
<html>
<body>
<img src="image?file=plan.jpg" alt="Plan" />
</body>
</html>
but all that is displayed is the word Plan.
My servlet has been compiled and put into webapps\test\classes\example directory.
My web.xml contains
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>example.ImageServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/image/*</url-pattern>
</servlet-mapping>
The servlet code is
package example;
import java.io.*;
import java.net.URLConnection;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ImageServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
          throws ServletException, IOException {
        String imageFilePath = getServletContext().getRealPath("/WEB-INF/images");
        // Get file name from request.
        String imageFileName = request.getParameter("file");
     System.out.println("Path: "+imageFilePath+" Name: "+imageFileName);
        // Check if file name is supplied to the request.
        if (imageFileName != null) {
            // Strip "../" and "..\" (avoid directory sniffing by hackers!).
            imageFileName = imageFileName.replaceAll("\\.+(\\\\|/)", "");
        } else {
            return;
        // Prepare file object.
        File imageFile = new File(imageFilePath, imageFileName);
        // Check if file actually exists in filesystem.
        if (!imageFile.exists()) {
            return;
        // Get content type by filename.
        String contentType = URLConnection.guessContentTypeFromName(imageFileName);
        // Check if file is actually an image (avoid download of other files by hackers!).
        // For all content types, see: http://www.w3schools.com/media/media_mimeref.asp
        if (contentType == null || !contentType.startsWith("image")) {
            return;
        // Prepare streams.
        BufferedInputStream input = null;
        BufferedOutputStream output = null;
        try {
            // Open image file.
            input = new BufferedInputStream(new FileInputStream(imageFile));
            int contentLength = input.available();
            // Init servlet response.
            response.reset();
            response.setContentLength(contentLength);
            response.setContentType(contentType);
            response.setHeader(
                "Content-disposition", "inline; filename=\"" + imageFileName + "\"");
            output = new BufferedOutputStream(response.getOutputStream());
            // Write file contents to response.
            while (contentLength-- > 0) {
                output.write(input.read());
            // Finalize task.
            output.flush();
        } catch (IOException e) {
            // Something went wrong?
            e.printStackTrace();
        } finally {
            // Gently close streams.
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    // This is a serious error. Do more than just printing a trace.
            if (output != null) {
                try {
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    // This is a serious error. Do more than just printing a trace.
}The servlet isn't being called - nothing is output to my server log file. Changing the name of my servlet doesn't change the result.
I can't see why the servlet isn't being called.
I have built another simple servlet that does work so I know my server is OK.
Any suggestions?
Thanks,
David

How to load and display a byte array (jpeg) image file dynamically in Flex?

My web service client (servlet) received a binary jpeg data from an Image Server. The Flex application invokes the
servlet via HttpService and receives the binary jpeg data as byte array. How could it be displayed dynamically
without writing the byte array to a jpeg file? Please help (some sample code is very much appreciated).

JPEGEncoder is only useful for converting BitmapData to ByteArray, not the other way around.
By the way JPEGEncoder and PNGEncoder are part of the Flex SDK now, so no need to use AS3Lib (alltough it's a good library to have around).
To display/use a ByteArray as image, use a Loader instance with the loadBytes method.
    Loader.loadBytes(bytes:ByteArray, context:LoaderContext = null);
Listen for the complete event on the Loader.contentLoaderInfo and get the BitmapData in the event handler.
private function loadJpeg():void {
    var loader:Loader = new Loader();
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
    //jpgBA is the ByteArray loaded from webservice
    loader.loadBytes(jpgBA);
private function loaderCompleteHandler(evt:Event):void {
    var t:LoaderInfo = evt.currentTarget as LoaderInfo;
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    img.source = t.content;
<mx:Image id="img" scaleContent="false" />

How to save Byte Array of raw data into JPEG image.

Hello!
I have a image and I stored its data as byte array as
bimage = bitmap1.getRawData();
now I have Byte[] bimage, I want to save it as .jpeg image.
and show that image..............

the short way is this:
ImageIO.write(bimage, "jpeg", new File("image.jpg"));
Where you use the original Image object... but it has to be a java.awt.image.RenderedImage (which a java.awt.image.BufferedImage is). So this method would come in handy.
     public static BufferedImage getBufferedImage(Image img) {
          // if the image is already a BufferedImage, cast and return it
          if((img instanceof BufferedImage) && background == null) {
               return (BufferedImage)img;
          // otherwise, create a new BufferedImage and draw the original
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          int w = img.getWidth(null);
          int h = img.getHeight(null);
          BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
          Graphics2D g2d = bi.createGraphics();
          g2d.drawImage(img, 0, 0, w, h, null);
          g2d.dispose();
          return bi;
     }If the byte array you have is raw image data, then you can look at the javax.imageio package and see what you can do with those classes.

Reading a JPEG as a byte array.

Hello everyone.
I am developing a project which involves using JPEG images with Java. I would like to use the java.awt.Image class but there's a snag:
I am reading the file in as a byte array and then need to pass the bytes to an object to be displayed as an image. "why not just read it as a normal JPEG file in the first place?!" I hear you say. Yes, this would be easier but there is a good reason as to why I am reading as a byte array first and this cannot be worked around.
If anyone has some suggestions I'd very much like to hear them.
All the best,
P.M.

If all you're going to do is display the image, then you can use Toolkit#createImage(byte[] imagedata). That's about as direct as you can get. If you plan on manipulating the images in any way, though, then as above post says ByteArrayInputStream + ImageIO is the way to go.
"why not just read it as a normal JPEG file in the first place?!" I hear you say. Yes, this would be easier but there is a good reason as to why I am reading as a byte array first and this cannot be worked around.Fun fact: For the ImageIO package, reading from the file is actually faster than reading from an InputStream that references the file's contents as a byte[] array. Specifically, the ImageInputStream implementation that wraps the file is faster then the one that wraps a generic InputStream.

Byte array size changes

For some reason the size of my byte arrays change, and it is causing problems using an AES Cipher.
The length of the byte array is 16 when I first encrypt text, but when I try and decrypt it, it tells me the length is 29. Then I have an IllegalBlockSizeException.
Can someone explain how to overcome this problem?
I used the UTF-8 encoding on Ubuntu 8.04

TamalinJava wrote:
For some reason the size of my byte arrays change, and it is causing problems using an AES Cipher.A byte[] has a fixed size, you cannot change it.
The length of the byte array is 16 when I first encrypt text, but when I try and decrypt it, it tells me the length is 29. Then I have an IllegalBlockSizeException.
I used the UTF-8 encoding on Ubuntu 8.04This is your problem. It translates values >= 128 to be two characters.
Can someone explain how to overcome this problem?Don't try to write binary data as if it were text. (Write it as binary data)

Changing a byte in a byte array???? HELP

Hey I have the following code
     String plainString = new String();
     byte[] byt = new byte[0];
     byte change;
     try
          int length = (int)(keyf.length());
          byt = new byte[(length++)];
          keyf.readFully(byt);
          keyf.seek(0);
     }catch(IOException e){System.err.println(e);}And I want to edit the byt array at position (length--) and add the character "," there. Also changing the byt array at its current position to eof. Anyone know what to do???

Make a new array with a size of length+1.byt = new byte[(length++)];
keyf.readFully(byt);
byte[] b2 = new byte[byt.length+1];
System.arraycopy(byt, 0, b2, 0, byt.length);
b2[b2.length - 1] = (byte)',';

Displaying Byte Array images in coldfusion

This has been driving me crazy for a couple of days now.I
have a Java class that returns pictures stored in a DB as a Byte
Array.
I am able to display the image but that is all i am able to
do - I want to display the image name, description etc in a HTML
before i display the actual image but i can't seem to find a way to
do that.
I tried using CFcontent as well and that did not help
either.This is what i am currently doing - and all that displays on
the screen is the picture and all content before the picture is
nowhere to be seen.
Picture Name: #variables.picName#
Picture Description:#variables.picDescription#
<cfscript>
context = getPageContext();
response = context.getResponse().getResponse();
out = response.getOutputStream();
response.setContentType("image/jpeg");
response.setContentLength(arrayLen(session.picture));
out.write(session.picture);
out.flush();
out.close();
</cfscript>
Any help will be greatly appreciated.

Mark,
Note that the portal sets the content type (e.g, text/html) and encoding
as the portal page starts rendering. In your case, the
setContentType() would be useless since the servlet container won't let
you change it. You can either use a popup browser window for the pdf as
Kunal suggested, or use an iframe if you want to render the pdf inside
the portlet window.
Subbu
Mark Gilleece wrote:
Hi,
i need to display a PDF file. The PDF is stored in a byte array. This works fine when i run my code (see below) from the .jpf via the debugger/browser, but when i use it as a portlet, in the portal, it does not work ?
Any help is much appreciated.
Thanks
Mark
byte[] pdfDocument = docStore.getPDF();
ServletOutputStream outPdf = response.getOutputStream();
response.setContentType("application/pdf");
outPdf.write(pdfDocument);
outPdf.flush();
outPdf.close();

How Do I Load An Animated GIF Into PictureBox Control From Byte Array?

I'm having a problem with loading an animated GIF int a picturebox control in a C# program after it has been converted to a base64 string, then converted to a byte array, then written to binary, then converted to a base64 string again, then converted to
a byte array, then loaded into a memory stream and finally into a picturebox control.
Here's the step-by-step code I've written:
1. First I open an animated GIF from a file and load it directly into a picturebox control. It animates just fine.
2. Next I convert the image in the picturebox control (pbTitlePageImage) to a base64 string as shown in the code below:
                if (pbTitlePageImage.Image != null)
                    string Image2BConverted;
                    using (Bitmap bm = new Bitmap(pbTitlePageImage.Image))
                        using (MemoryStream ms = new MemoryStream())
                            bm.Save(ms, ImageFormat.Jpeg);
                            Image2BConverted = Convert.ToBase64String(ms.ToArray());
                            GameInfo.TitlePageImage = Image2BConverted;
                            ms.Close();
                            GameInfo.TitlePageImagePresent = true;
                            ProjectNeedsSaving = true;
3. Then I write the base64 string to a binary file using FileStream and BinaryWriter.
4. Next I get the image from the binary file using FileStream and BinaryReader and assign it to a string variable. It is now a base64 string again.
5. Next I load the base64 string into a byte array, then I load it into StreamReader and finally into the picturebox control (pbGameImages) as shown in the code below:
byte[] TitlePageImageBuffer = Convert.FromBase64String(GameInfo.TitlePageImage);
                        MemoryStream memTitlePageImageStream = new MemoryStream(TitlePageImageBuffer, 0, TitlePageImageBuffer.Length);
                        memTitlePageImageStream.Write(TitlePageImageBuffer, 0, TitlePageImageBuffer.Length);
                        memTitlePageImageStream.Position = 0;
                        pbGameImages.Image = Image.FromStream(memTitlePageImageStream, true);
                        memTitlePageImageStream.Close();
                        memTitlePageImageStream = null;
                        TitlePageImageBuffer = null;
This step-by-step will work with all image file types except animated GIFs (standard GIFs work fine). It looks like it's just taking one frame from the animation and loading it into the picturebox. I need to be able to load the entire animation. Does any of
the code above cause the animation to be lost? Any ideas?

There is an ImageAnimator so you may not need to use byte array instead.
ImageAnimator.Animate Method
http://msdn.microsoft.com/en-us/library/system.drawing.imageanimator.animate(v=vs.110).aspx
chanmm
chanmm

How do I read directly from file into byte array

I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
try
            //Read File Contents into a Buffered Image
            /** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
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            BufferedImage bi = null;
            ImageReader ir = null;
            ImageInputStream stream = ImageIO.createImageInputStream(new File(path));
            final Iterator i = ImageIO.getImageReaders(stream);
            if (i.hasNext())
                ir = (ImageReader) i.next();
                ir.setInput(stream);
                ImageReadParam param = ir.getDefaultReadParam();
                ImageTypeSpecifier typeToUse = null;
                for (Iterator i2 = ir.getImageTypes(0); i2.hasNext();)
                    ImageTypeSpecifier type = (ImageTypeSpecifier) i2.next();
                    if (type.getColorModel().getColorSpace().isCS_sRGB())
                        typeToUse = type;
                if (typeToUse != null)
                    param.setDestinationType(typeToUse);
                bi = ir.read(0, param);
                //ir.dispose(); seem to reference this in write
                //stream.close();
            //Write Buffered Image to Byte ArrayOutput Stream
            if (bi != null)
                //Convert to byte array
                final ByteArrayOutputStream output = new ByteArrayOutputStream();
                //Try and find corresponding writer for reader but if not possible
                //we use JPG (which is always installed) instead.
                final ImageWriter iw = ImageIO.getImageWriter(ir);
                if (iw != null)
                    if (ImageIO.write(bi, ir.getFormatName(), new DataOutputStream(output)) == false)
                        MainWindow.logger.warning("Unable to Write Image");
                else
                    if (ImageIO.write(bi, "JPG", new DataOutputStream(output)) == false)
                        MainWindow.logger.warning("Warning Unable to Write Image as JPEG");
                //Add to image list
                final byte[] imageData = output.toByteArray();
                Images.addImage(imageData);


If you don't need to manipulate the image in any way I would suggest you just read the image file directly into a byte array (without ImageReader) and then create the BufferedImage from that byte array.

How do I store an Int, a short, and multiple bytes from file in byte array

I'm attempting to do this for a project but can't figure out how to store the three values in one byte array. This is what i've tried
public void send(byte[] input)
          // TODO
          ByteArrayInputStream bais = new ByteArrayInputStream(input);
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          DataOutputStream dos = new DataOutputStream(baos);
          byte[] pData = new byte[100];
          try {
               dos.writeShort(checkSum);
               dos.writeInt(nextSeqNum);
               pData=baos.toByteArray();
               bais.read(pData);
          } catch (IOException e) {
          DatagramPacket dgp = new DatagramPacket(pData, pData.length);When i set pData=baos.toByteArray() it changes the size and then stops me from being able to read the other 94 bytes into the array to send. Any ideas?

You don't need the ByteArrayInputStream at all.
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
dos.write(input);
pData = baos.toByteArray();
When i set pData=baos.toByteArray() it changes the sizeNo, it makes it refer to a new byte[] array containing what you've written to the BAOS. That's what it's supposed to do.

How to get a string or byte array representation of an Image/BufferedImage?

I have a java.awt.Image object that I want to transfer to a server application (.NET) through a http post request.
To do that I would like to encode the Image to jpeg format and convert it to a string or byte array to be able to send it in a way that the receiver application (.NET) could handle. So, I've tried to do like this.
private void send(Image image) {
    int width = image.getWidth(null);
    int height = image.getHeight(null);
    try {
        BufferedImage buffImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        ImageIcon imageIcon = new ImageIcon(image);
        ImageObserver observer = imageIcon.getImageObserver();
        buffImage.getGraphics().setColor(new Color(255, 255, 255));
        buffImage.getGraphics().fillRect(0, 0, width, height);
        buffImage.getGraphics().drawImage(imageIcon.getImage(), 0, 0, observer);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(stream);
        jpeg.encode(buffImage);
        URL url = new URL(/* my url... */);
        URLConnection connection = url.openConnection();
        String boundary = "--------" + Long.toHexString(System.currentTimeMillis());
        connection.setRequestProperty("method", "POST");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        String output = "--" + boundary + "\r\n"
                      + "Content-Disposition: form-data; name=\"myImage\"; filename=\"myFilename.jpg\"\r\n"
                      + "Content-Type: image/jpeg\r\n"
                      + "Content-Transfer-Encoding: base64\r\n\r\n"
                      + new String(stream.toByteArray())
                      + "\r\n--" + boundary + "--\r\n";
        connection.setDoOutput(true);
        connection.getOutputStream().write(output.getBytes());
        connection.connect();
    } catch {
}This code works, but the image I get when I save it from the receiver application is distorted. The width and height is correct, but the content and colors are really weird. I tried to set different image types (first line inside the try-block), and this gave me different distorsions, but no image type gave me the correct image.
Maybe I should say that I can display the original Image object on screen correctly.
I also realized that the Image object is an instance of BufferedImage, so I thought I could skip the first six lines inside the try-block, but that doesn't help. This way I don't have to set the image type in the constructor, but the result still is color distorted.
Any ideas on how to get from an Image/BufferedImage to a string or byte array representation of the image in jpeg format?

Here you go:
private static void send(BufferedImage image) throws Exception
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ImageIO.write(image, "jpeg", byteArrayOutputStream);
    byte[] imageByteArray = byteArrayOutputStream.toByteArray();
    URL url = new URL("http://<host>:<port>");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setRequestMethod("POST");
    OutputStream outputStream = connection.getOutputStream();
    outputStream.write(imageByteArray, 0, imageByteArray.length);
    outputStream.close();
    connection.connect();
    // alternative to connect is to get & close the input stream
    // connection.getInputStream().close();
}

How to send byte array and String values to servlet from Swing application

Hi all,
I am new to swing, servlet, and socket connection.
I have swing application to draw images and some input data. I dont know to send to server.
byte[] buf = baos.toByteArray();
URL servletURL = new URL("http://10.70.70.1:8080/servlet/SaveImage)
URLConnection conn = servletURL.openConnection();
conn.setDoOutput(true);
BufferedWriter out = new BufferedWriter( new OutputStreamWriter( conn.getOutputStream() ) );
out.write(buf&a=aaaa&b=bbbbb);
out.flush();
out.close();
can I do like this. Strings are received in server side perfect. but i cant get byte array data. Please help me.
Thanks in advance.

<img src="myservlet">
In your myservlet:
response.setContentType("image/jpeg");
then write your image date via ImageIO that uses response output stream.

Change quality of JPEG byte array

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