Convert grayscale to colored images

Hi
I am stuck with my program.
BufferedImage gray = new BufferedImage(bi.getWidth(), bi.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
Graphics g = gray.getGraphics();
g.drawImage(bi, 0, 0, null);
g.dispose();using the above code, i have converted a colored image to a grayscale image.
now my problem is, i want to convert that grayscale image back to colored.
is there any way to do so?
please help
thanks

I am no expert in this, but I believe that when you lose the color information, it is lost forever never to be retrieved, that the basic premise of your program is incorrect. So, perhaps you can store information on what "filters" were applied (I'm not familiar with this "filter" concept) and in what order, and then after you have completed all the gray image processing, apply these filters to the stored colored image and then save it.

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argh... got confuse cos your subject.
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Hi opalo,
this code may help you...
import java.awt.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
class Write1 extends Component {
//--- Private constants
private final static int BITMAPFILEHEADER_SIZE = 14;
private final static int BITMAPINFOHEADER_SIZE = 40;
//--- Private variable declaration
//--- Bitmap file header
private byte bitmapFileHeader [] = new byte [14];
private byte bfType [] = {'B', 'M'};
private int bfSize = 0;
private int bfReserved1 = 0;
private int bfReserved2 = 0;
private int bfOffBits = BITMAPFILEHEADER_SIZE + BITMAPINFOHEADER_SIZE;
//--- Bitmap info header
private byte bitmapInfoHeader [] = new byte [40];
private int biSize = BITMAPINFOHEADER_SIZE;
private int biWidth = 50;
private int biHeight = 70;
private int biPlanes = 1;
//private int biBitCount = 24;
private int biBitCount = 1;
private int biCompression = 0;
private int biSizeImage = 0x030000;
private int biXPelsPerMeter = 0x0;
private int biYPelsPerMeter = 0x0;
private int biClrUsed = 0;
private int biClrImportant = 0;
//--- Bitmap raw data
private int bitmap [];
//--- File section
private FileOutputStream fo;
//--- Default constructor
public Write1() {
public void saveBitmap (String parFilename, Image parImage, int
parWidth, int parHeight) {
try {
fo = new FileOutputStream (parFilename);
save (parImage, parWidth, parHeight);
fo.close ();
catch (Exception saveEx) {
saveEx.printStackTrace ();
* The saveMethod is the main method of the process. This method
* will call the convertImage method to convert the memory image to
* a byte array; method writeBitmapFileHeader creates and writes
* the bitmap file header; writeBitmapInfoHeader creates the
* information header; and writeBitmap writes the image.
private void save (Image parImage, int parWidth, int parHeight) {
try {
convertImage (parImage, parWidth, parHeight);
writeBitmapFileHeader ();
writeBitmapInfoHeader ();
writeBitmap ();
catch (Exception saveEx) {
saveEx.printStackTrace ();
* convertImage converts the memory image to the bitmap format (BRG).
* It also computes some information for the bitmap info header.
private boolean convertImage (Image parImage, int parWidth, int parHeight) {
int pad;
bitmap = new int [parWidth * parHeight];
PixelGrabber pg = new PixelGrabber (parImage, 0, 0, parWidth, parHeight,
bitmap, 0, parWidth);
try {
pg.grabPixels ();
catch (InterruptedException e) {
e.printStackTrace ();
return (false);
pad = (4 - ((parWidth * 3) % 4)) * parHeight;
biSizeImage = ((parWidth * parHeight) * 3) + pad;
bfSize = biSizeImage + BITMAPFILEHEADER_SIZE +
BITMAPINFOHEADER_SIZE;
biWidth = parWidth;
biHeight = parHeight;
return (true);
* writeBitmap converts the image returned from the pixel grabber to
* the format required. Remember: scan lines are inverted in
* a bitmap file!
* Each scan line must be padded to an even 4-byte boundary.
private void writeBitmap () {
int size;
int value;
int j;
int i;
int rowCount;
int rowIndex;
int lastRowIndex;
int pad;
int padCount;
byte rgb [] = new byte [3];
size = (biWidth * biHeight) - 1;
pad = 4 - ((biWidth * 3) % 4);
if (pad == 4) // <==== Bug correction
pad = 0; // <==== Bug correction
rowCount = 1;
padCount = 0;
rowIndex = size - biWidth;
lastRowIndex = rowIndex;
try {
for (j = 0; j < size; j++) {
value = bitmap [rowIndex];
rgb [0] = (byte) (value & 0xFF);
rgb [1] = (byte) ((value >> 8) & 0xFF);
rgb [2] = (byte) ((value >> 16) & 0xFF);
fo.write (rgb);
if (rowCount == biWidth) {
padCount += pad;
for (i = 1; i <= pad; i++) {
fo.write (0x00);
int b = 1200;
fo.write(b);
rowCount = 1;
rowIndex = lastRowIndex - biWidth;
lastRowIndex = rowIndex;
else
rowCount++;
rowIndex++;
//--- Update the size of the file
bfSize += padCount - pad;
biSizeImage += padCount - pad;
catch (Exception wb) {
wb.printStackTrace ();
* writeBitmapFileHeader writes the bitmap file header to the file.
private void writeBitmapFileHeader () {
try {
fo.write (bfType);
fo.write (intToDWord (bfSize));
fo.write (intToWord (bfReserved1));
fo.write (intToWord (bfReserved2));
fo.write (intToDWord (bfOffBits));
catch (Exception wbfh) {
wbfh.printStackTrace ();
* writeBitmapInfoHeader writes the bitmap information header
* to the file.
private void writeBitmapInfoHeader () {
try {
fo.write (intToDWord (biSize));
fo.write (intToDWord (biWidth));
fo.write (intToDWord (biHeight));
fo.write (intToWord (biPlanes));
fo.write (intToWord (biBitCount));
fo.write (intToDWord (biCompression));
fo.write (intToDWord (biSizeImage));
fo.write (intToDWord (biXPelsPerMeter));
fo.write (intToDWord (biYPelsPerMeter));
fo.write (intToDWord (biClrUsed));
fo.write (intToDWord (biClrImportant));
// DataOutputStream temp = new DataOutputStream(fo);
// int m = 32;
// temp.writeInt(m);
catch (Exception wbih) {
wbih.printStackTrace ();
* intToWord converts an int to a word, where the return
* value is stored in a 2-byte array.
private byte [] intToWord (int parValue) {
byte retValue [] = new byte [2];
retValue [0] = (byte) (parValue & 0x00FF);
retValue [1] = (byte) ((parValue >> 8) & 0x00FF);
return (retValue);
* intToDWord converts an int to a double word, where the return
* value is stored in a 4-byte array.
private byte [] intToDWord (int parValue) {
byte retValue [] = new byte [4];
retValue [0] = (byte) (parValue & 0x00FF);
retValue [1] = (byte) ((parValue >> 8) & 0x000000FF);
retValue [2] = (byte) ((parValue >> 16) & 0x000000FF);
retValue [3] = (byte) ((parValue >> 24) & 0x000000FF);
return (retValue);
class Writebmp
     public static void main(String args[])
          //Image img = Toolkit.getDefaultToolkit().getImage("jatin.bmp");
          try
          File filename = new File("jatin_test.bmp");
          BufferedImage image = ImageIO.read(filename);
          Graphics graphics = image.getGraphics();
          graphics.drawString("उजगर",10,30);
          Write1 w = new Write1();
          Image img = Toolkit.getDefaultToolkit().getImage("jatin_test.bmp");
          w.saveBitmap("jatin_test.bmp",img,200,200);
          catch (IOException e)
System.err.println ("Unable to write to file");
System.exit(-1);
}

Convert a jpeg file into a 1-bit bmp file (2 colors image).

Hi. I�m having serious problems to convert a jpeg file into a 1-bit bmp file (2 colors image).
First, i,ve tried to get a 1-bit jpeg. But i think this is not possible, so what i have to do is to get a 1-bit bpm file.
I�m using FileSaver.saveAsBmp(String destination) and what i get is a bmp image, but with 16M colors, but what i want is a 2 colors bmp file. A black and white image.
Does anybody know how to do this? I�m really getting crazy with ths problem.
Thanks in advance

You better read this at
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Convert "Grayscale I16" to "RGB U64"

Hello,
I need to convert an image from Grayscale I16 to RGB U64, but it doesn't work (I have joined a zip file).
I think there is a bug in the NI Vision, or it's not implemented because I have no problem to do it from Grayscale U8 to RBG32.
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Solved!
Go to Solution.
Attachments:
tests.zip ‏217 KB

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Also, i invite you to read the information on our website:
How Do I Convert a Color Image to Grayscale?
http://digital.ni.com/public.nsf/allkb/ED42C55C29B9B34C862570A60079952E?OpenDocument
Regards,
Rémi D.
National Instruments France
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