Deriving color space of an image from a byte array input stream.

I was wondering, is it possible to derive the color space of an image, i.e. RGB, YCC, GRAY by calculating its bytes?

Calculate bytes just means doing operations on the
byte values. That's how I got the height and width of
the image. Now, I'm wondering if it is possible for
the color space.Look at the format specifications...
By the way, do all image file types have different
color space or could they all have the same color
space, for example, RGB?They can have different color spaces. RGB, ARGB, CMYK, some Adobe format...

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CTRL + ALT + Click on the part of the component that you want to change. This brings up the Hidden Dom Inspector, background of component will be surrounded with a red outline (Make sure the red outline is surrounding the part of the tabset you want to change), Now you go to properties sheet and click the ellipses next to rules property this will pop up a dialog you look in this list (At the top) to see the default style classes that are affecting the rendering of the component outlined in red. (You will be able to select different sections of a single component) then you just rewrite the style class that you want to change in your Stylesheet (You will not find the styleclass that you want to change because it is a part of your theme .jar but as long as you name it exactly the same and place in your stylesheet it will override the theme .jar style classes) it's actually very easy -- you were right should be a piece of cake for a guru. Don't have the link handy but you can check out Winston's Blog on changing Table Formatting to get this information...It is EXTREMELY useful if you want your apps to have a custom look and not default that comes with Creator Themes.
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How to remove blank data from a byte array

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How to convert a Image object to byte Array?

Who can tell me, how to convert Image object to byte Array?
Example:
public byte[] convertImage(Image img) {
byte[] b = new byte...........
return b;

Hello,
any way would suit me, I just need a way to convert Image or BufferedImage to a byte[], so that I can save them. Actually I need to save both jpg and gif files without using any 3rd party classes. Please help me out.
thanx and best wishes

Match color space when opening image in photoshop

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when i set my display as pro photo RGB, it base blue tone, i must use Apple's preset called "colour LCD"

Good day!
if there is any problem because my notebook display is set (system preferences) to "color LCD"
Your screen profile should generally not be set to your RGB Working Space as this would kind of negate Color Management.
And in the absence of a proper custom profile the maker’s default profile seems to be a valid choice.
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Color Space on Thumbnail Image Variants

Hi all-
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If I create a custom variant as .jpg and of the RGB color space, it works fine after generation. Is this a bug? Or is there a way to force the generation of thumbnails? I was trying to not have too many variants in my repository because I was worried about bloating it. Perhaps this shouldn't be a concern, but it still seems as if the thumbnail should get converted to RGB according to the settings in the Console. Any thoughts?
Thanks
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Tim,
Sounds like this may be a bug. Since the Thumbnails are set to RGB, and cannot be changed, it seems as though they should be generated in RGB color space.
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Color Space info for images

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>> images are still a bit washed out with a warmish/ yellow cast to them, particularly, my black and white images
Here is a simple test to help evaluate if the monitor profile is reasonably good:
Open a RGB file in Photoshop (flatten if not already flattened).
Press M key> Drag a selection> Com+Shift+U (Desaturate).
Com+Z (to toggle back and forth).
If the unsaturated selection looks neutral you've got a reasonably fair monitor profile.
If selection has color casts (not neutral) -- you have a bad monitor profile
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Here is a simple test to help evaluate if a bad monitor profile is whacking out your Photoshop color:
Monitors/Displays (control panel)> Color> highlight AppleRGB or sRGB (don't run Calibrate), quit and reboot.
If the Photoshop colors are back under control, then the problem was most surely a bad monitor profile go back into Monitors/Displays> Color and Calibrate a good profile highlight (load) sRGB, or preferably, the monitor's OEM profile as a starting point.
If you are using a puck, it is likely defective; or your monitor hardware is the culprit...search it on Google by model number

Selected color profile for new images from "clipboard" is wrong in CS6

I have given up trying to find the answer to this myself.
Steps to reproduce:
1. Take a screenshot of something in your web browser (macintosh CMD+SHIFT+4) to the clipboard.
2. Select File > New from the menu. Clipboard should be the selected Preset.
3. Notice how in CS6 the color profile under "Advanced" is "Display" and NOT "sRGB" — in CS5 it is sRGB.
4. Paste from the clipboard into your new document and get the color profile mis-match warning if you are in CS6.
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Nothing I do in an attempt to fix this is working. I have sRGB set as my default profile in color settings, and nothing I do changes this setting for the "Clipboard" preset.
I am getting sick of forgetting to manually select "sRGB" every time, opening up a new document sized to my clipboard and then getting the color profle mismatch warning when I paste in the clipboard contents!
I take so many screenshots as I develop websites this is a CONSTANT problem as I am constantly creating new documents from the clipboard to check alignments, zoom in to get color samples, and many other reasons.
Message was edited by: DrunkCyclist

That helps a little. It explains why "Display" is selected when I create a new from the clipboard in PS.
The ColorSync profile from a screenshot opened in the Preview App shows up as "Color LCD" in the inspector.
So, I assume what is happening in PS is that the new document is being created in the working color space and my clipboard contents don't match that and therefore causes the warning?
I could see getting a warning if I create a new document from the clipboard in PS and it embeds the "Display" profile within it, and then I try and paste something which has an sRGB (or other) embedded profile, but I was assuming the new document from the clipboard contents would have the same color profile as the clipboard contents.
I just don't get why I get a warning when I create the new document and the very first thing I try and do is paste the clipboard contents into said document.
However, when I select "sRGB" from the dropdown list instead of "Display" in the PS dialogue box it does not give me the mismatch warning.
Although the warning does say my source and destination document are both using the "Display" profile but my working space is sRGB.
The more I think about it, I may have just checked the "Don't show again" box in CS5 if I ever had the same issues and therefore never dealt with that again!
I am going to go read as much as I can about the color profiles in PS. I used to deal with this a lot as a print designer but not so much anymore working in UI design. I only really look into these issues when I get weird color shifts on saved files and things of that nature.
Thanks for taking the time to explain some things!

Error when creating BufferedImage with IndexColorModel from a byte array.

Hi, I have a 1-dimentional byte array and an IndexColorTable, and I can't figure out how to combine the 2 into an BufferedImage without unnecessary copying/reallocating of the image buffer.
The color model I have is:
int [] cmap = new int [numColors];
cmap[i++] = 0xffa0f000; /etc.
new IndexColorModel(8, 22, cmap, 0, true, transparentIndex, DataBuffer.TYPE_BYTE );Thanks for your help
-Ben
Ps.
I've was looking at some example code (http://javaalmanac.com/egs/java.awt.image/Mandelbrot2.html?l=rel), and can't figure out how to go from the color model they're using to the one I have (the 8 bit one specified above). When I replace the 4bit colormodel in the code below with the 8bit color model specified above, I get the following error:
[java] java.lang.IllegalArgumentException: Raster ByteInterleavedRaster: width = 5120 height = 3520 #numDataElements 1 dataOff[0] = 0 is incompatible with ColorModel IndexColorModel: #pixelBits = 8 numComponents = 4 color space = java.awt.color.ICC_ColorSpace@c51355 transparency = 2 transIndex = 22 has alpha = true isAlphaPre = false
[java] at java.awt.image.BufferedImage.<init>(BufferedImage.java:613)
Code:
byte[] pixelArray = (byte[]) getData_CHAR();
int width = 5120;
int height = 3520;
int numbytes = width*height;
//create DataBuffer using byte buffer of pixel data.
DataBuffer dataBuffer = new DataBufferByte(pixelArray, numbytes, 0);
//prepare a sample model that specifies a storage 8-bits of pixel data in an 8-bit data element
int bitMasks[] = new int[]{0xf};
SinglePixelPackedSampleModel sampleModel = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, width, height, bitMasks);
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//generate 16-color model
byte[] r = new byte[16];
byte[] g = new byte[16];
byte[] b = new byte[16];
r[0] = 0; g[0] = 0; b[0] = 0;
r[1] = 0; g[1] = 0; b[1] = (byte)192;
r[2] = 0; g[2] = 0; b[2] = (byte)255;
r[3] = 0; g[3] = (byte)192; b[3] = 0;
r[4] = 0; g[4] = (byte)255; b[4] = 0;
r[5] = 0; g[5] = (byte)192; b[5] = (byte)192;
r[6] = 0; g[6] = (byte)255; b[6] = (byte)255;
r[7] = (byte)192; g[7] = 0; b[7] = 0;
r[8] = (byte)255; g[8] = 0; b[8] = 0;
r[9] = (byte)192; g[9] = 0; b[9] = (byte)192;
r[10] = (byte)255; g[10] = 0; b[10] = (byte)255;
r[11] = (byte)192; g[11] = (byte)192; b[11] = 0;
r[12] = (byte)255; g[12] = (byte)255; b[12] = 0;
r[13] = (byte)80; g[13] = (byte)80; b[13] = (byte)80;
r[14] = (byte)192; g[14] = (byte)192; b[14] = (byte)192;
r[15] = (byte)255; g[15] = (byte)255; b[15] = (byte)255;
//create buffered image
ColorModel colorModel = new IndexColorModel(4, 16, r, g, b);
BufferedImage image = new BufferedImage(colorModel, writableRaster, false, null);Message was edited by:
ben_weisburd
Message was edited by:
ben_weisburd

I had the same problem too.
anyone found the solution for this problem?
thanks
Bruno Rabino
When I try to make a MD-form, where the base-table for the detail contains a column with a BLOB-datatype. I get following error when I finish creation of the form.
Error: Exception from wwv_generate_component.build_procedure (WWV-01821)
Error creating module: ORA-01403: no data found (WWV-16042)
When I use the table with the BLOB as master or in a form, it works fine.
Has anyone else experienced this problem? Or knows a way to fix or work around it. Thanks in advance.
Portal version: 3.0.6.6.5
null

Display an object of Image type or Byte Array

Hi, lets say i got an image stored in the Image format or byte[]. How can i make it display the image on the screen by taking the values in byte array or Image field?

Thanks rahul,
The thing is, i am generating a chart in a servlet
and setting the image in the form of a byte [] to the
view bean ( which is binded to the jsp, springs
framework ). The servlet would return the view bean
to the jsp and in the jsp, i am suppose to print this
byte array so as to give me the image..
I hope this makes sense.. pls help me ou!Well letme see if i got tht right or not,
you are trying to call Your MODEL (Business layer / Spring Container) from a servlet and you are expressing that logic in form of chart (Image) and trying to save it as a byte array in a view bean and you want to print /display that as an image in a jsp (After Servlet fwd / redirect action) which includes other data using a ViewBean.
If this is the case...
As the forwaded JSP can include both image and Textual (hypertext too)..we can try a work around hear...Lets dedicate a Servlet which retreives byte [] from a view bean and gives us an image output. hear is an example and this could be a way.
Prior to that i'm trying to make few assumptions here....
1).The chart image which we are trying to express would of format JPEG.
2).we are trying to take help of<img> tag to display the image from the image generating servlet.
here is my approach....
ViewBean.java:
============
public class ViewBean implements serializable{
byte piechart[];
byte barchart[];
byte chart3D[];
public ViewBean(){
public byte[] getPieChart(){
return(this.piechart);
public byte[] getBarChart(){
return(this.barchart);
public byte[] get3DChart(){
return(this.chart3D);
public void setPieChart(byte piechart[]){
this.piechart = piechart;
public void setBarChart(byte barchart[]){
this.barchart = barchart;
public void set3DChart(byte chart3D[]){
this.chart3D = chart3D;
}ControllerServlet.java:
=================
(This could also be an ActionClass(Ref Struts) a Backing Bean(Ref JSF) or anything which stays at the Controller Layer)
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
/* There are few different implementations of getting   BeanFactory Resource
In,the below example i have used XmlBeanFactory Object to create an instance of (Spring) BeanFactory */
BeanFactory factory =
new XmlBeanFactory(new FileInputStream("SpringResource.xml"));
//write a Util Logic in your Implementation class using JFreeChart (or some open source chart library) and express the images by returning a byte[]
ChartService chartService =
(GreetingService) factory.getBean("chartService");
ViewBean vb = new ViewBean();
vb.setPieChart(chartService.generatePieChart(request.getParameter("<someparam>"));
vb.setBarChart(chartService.generateBarChart(request.getParameter("<someparam1>"));
vb.set3DChart(chartService.generate3DChart(request.getParameter("<someparam2>"));
chartService = null;
HttpSession session = request.getSession(false);
session.setAttribute("ViewBean",vb);
response.sendRedirect("jsp/DisplayReports.jsp");
}DisplayReports.jsp :
================
<%@ page language="java" %>
<html>
<head>
<title>reports</title>
</head>
<body>
<h1 align="center">Pie Chart </h1>
<center><img src="ImageServlet?req=1" /></center>
<h1 align="center">Bar Chart </h1>
<center><img src="ImageServlet?req=2" /></center>
<h1 align="center">3D Chart</h1>
<center><img src="ImageServlet?req=3" /></center>
</body>
</html>ImageServlet.java
==============
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
       byte buffer[];
        HttpSession session = request.getSession(false);
        ViewBean vb = (ViewBean) session.getAttribute("ViewBean");
        String req = request.getParameter("req");
        if(req.equals("1") == true)
            buffer = vb.getPieChart();
        else if(req.equals("2") == true)
             buffer = vb.getBarChart();
        else if(req.equals("3") == true)
             buffer = vb.get3DChart();
        JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new ByteArrayInputStream(buffer));
        BufferedImage image =decoder.decodeAsBufferedImage() ;
        response.setContentType("image/jpeg");
        // Send back image
        ServletOutputStream sos = response.getOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
        encoder.encode(image);
    }Note: Through ImageServlet is a Servlet i would categorise it under presentation layer rather to be a part of Controller and added to it all this could be easily relaced by a reporting(BI) server like JasperServer,Pentaho,Actuate................
Hope the stated implementation had given some idea to you....
However,If you want to further look into similar implementations take a look at
http://www.swiftchart.com/exampleapp.htm#e5
which i believe to be a wonderful tutor for such implementations...
However, there are many simple (Open) solutions to the stated problem.. if you are Using MyFaces along with spring... i would recommend usage of JSF Chart Tag which is very simple to use all it requires need is to write a chart Object generating methos inside our backing bean.
For further reference have a look at the below links
http://www.jroller.com/page/cagataycivici?entry=acegi_jsf_components_hit_the
http://jsf-comp.sourceforge.net/components/chartcreator/index.html
NOTE:I've tried it personally using MyFaces it was working gr8 but i had a hardtime on deploying my appln on a Portal Server(Liferay).If you find a workaround i'd be glad to know about it.
& there are many BI Open Source Server Appls that can take care of this work too.(Maintainace wud be a tough ask when we go for this)
For, the design perspective had i've been ur PM i wud have choose BI Server if it was corporate web appln on which we work on.
Hope this might be of some help :)
REGARDS,
RaHuL

How to convert an Image to a byte array?

I want to make a screenshot and then convert the image to a byte of arrays so I can send it through a BufferedOutputStream.
try
               robot = new Robot();
               screenshot = robot.createScreenCapture(new Rectangle(500,500));
               imageFile = new File("image.png");
               ImageInputStream iis = ImageIO.createImageInputStream(screenshot);
               byte[] data = new byte[1024];
               byte[] tmp = new byte[0];
               byte[] myArrayImage = new byte[0];
               int len = 0;
               int total = 0;
               while((len = iis.read(data)) != -1 ) // LINE 52 --- EXCEPTION CATCHED HERE
                    total += len;
                    tmp = myArrayImage;
                    myArrayImage = new byte[total];
                    System.arraycopy(tmp,0,myArrayImage,0,tmp.length);
                    System.arraycopy(data,0,myArrayImage,tmp.length,len);
               ios.close();I get this exception while running:
Exception in thread "Thread-0" java.lang.NullPointerException
at Server.run(Server.java:52)
at java.lang.Thread.run(Unknown Source)

Fixed that. I got a new problem.
When I connect to my simple server application that reads the image file, converts it to an array of bytes and sends it back, the file is created on the client side and it containts data, but I am not able to open the image. I have checked that the image that the server is sending is working. So where is the problem?
The client application recieves the image as following:
public void run()
        try
            socket = new Socket("127.0.0.1", 2000);
            BufferedOutputStream out_file = new BufferedOutputStream(new FileOutputStream("recieved_img.png"));
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            int inputLine;
            while((inputLine = in.read()) != -1)
                char c = (char)inputLine;
                System.out.println(c);
                out_file.write(inputLine);
        catch(IOException err){ err.printStackTrace(); }
    }And the server sends the image like this;
try
          socket = server.accept();
          in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
          out = new BufferedOutputStream(socket.getOutputStream());
          out.write(25);
          while((inputLine = in.readLine()) != null)
               System.out.println(myArrayImage.length);
          System.out.println(inputLine);
                    out.write(myArrayImage);     // Send the array of bytes
     }

Displaying an html page from a byte array

I'm trying to display an html page that i receive from a byte[ ] but the navigator asks me to download it instead of displaying it.

exactly a better option here would be display that HTML content using a dedicated servlet/jsp.
checkout below example code snippet hope that might help
public void doPost(request,response)throws ServletException,IOException{
//fetch HTML bytes.
Byte buffer[] = Delegate.getBufferData();
ByteArrayInputStream in = new ByteArrayInputStream(buffer);
int contentSize = in.available();
response.setContentType("text/html");
response.setContentLength(contentSize);
BufferedOutputStream out = null;
   try{
        out = new BufferedOutputStream(response.getOutputStream());
        while( contentSize-- > 0 )
            out.write(in.read());
         out.flush();
   }catch(Exception exp){
         exp.printStackTrace();
          throw new Exception(exp.getMessage());
   }finally{
          try{
                if(out != null)
                   out.close();
                if(in != null)
                    in.close();
          }catch(Exception ep){
                          ep.printStackTrace();
                          throw new Exception(ep.getMessage());
          }finally{
                out = null;
                in = null;
}and respectively call the servlet.
Hope this might help :)
REGARDS,
RaHuL

Converting Image.jpg to byte array

Hi,
How do i convert a image (in any format like .jpeg, .bmp, gif) into a byte array
And also vice versa, converting byte array to image format
Thank you

how about Class.getResourceAsStream(String name).read(byte[] b)?

Color change when transferring image from Photoshop to After Effects

Hi everyone,
I am trying to import a logo from photoshop CS6 to After Effects CS6, however the black color within the image changes to a dark grey when it gets into AE. I noticed on the color picker in PS that it changes to the same grey color that is used as the replacement web safe color. Therefore I'm assuming AE is just converting everything into web safe colors.
Is there something I need to change in AE to allow me to import the image and keep all the original non web safe photoshop colors?
Sorry if this is a very basic question thats been answered before, I couldn't seem to find the answer within these forums.
Many thanks in advance,
Spencer

This has nothing to do with web safe. You are making a mess of color management/ color profiles. You have soemthing enabled in PS and since AE by default doesn't use any color managemnt and just assumes plain sRGB, the colors change. There's no easy explanations here, but you have soem reading up to do about color management in general and also specifically how Photoshop corrects for monitor profiles and how to use the Proof Preview to compensate for that or how to establish a workflwo that mimicsa AE's "unmanaged" colorspace.
Mylenium

Deriving color space of an image from a byte array input stream.

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