How to save greyscale image as jpeg?

Anyone know how to save a greyscale image as a jpeg in labview?

Hi Jonathan,
If I understand you correctly, you had a greyscaled image, which you applied color to and now want to save this new image. Before I jump into possibly solutions, I have a question for you.
Are you using any IMAQ, Motion, or Vision VIs? If not, try using the Picture Control VIs - specifically, the "Write JPEG File.VI"
If that won't work, please post a small piece of code illustrating the issue.
Thanks!
Janell Rodriguez | Applications Engineer | National Instruments

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import java.awt.font.*;
import java.awt.geom.*;
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Hi,
Here is some code that may help.
NOTES: pixels were recieved from a PixelGrabber proccess.
transColor was picked from an image (you can supply your own code its just an int).
blnTrans is a boolean flag indicating that a transparaent color was picked.
dim is the dimensions of the image (any image will do).
import javax.swing.*;
import javax.media.jai.*;
import java.awt.event.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageEncoder;
import com.sun.media.jai.codec.PNGEncodeParam;
import com.sun.media.jai.codec.BMPEncodeParam;
import com.sun.media.jai.codec.TIFFEncodeParam;
import java.awt.image.*;
import java.awt.color.*;
import Acme.JPM.Encoders.*;
//Some more Code
int fileType = 0;
File file = null;
if (pixels != null)
//create a file save dialog.
//create a File Chooser.
fc = new JFileChooser(););
int returnValue = fc.showSaveDialog(this);
//detemine the choose.
if (returnValue == JFileChooser.APPROVE_OPTION)
file = fc.getSelectedFile();
//get the file ext and translate for switch.
Utils ut = new Utils();
String ext = ut.getExtension(file);
if (ext.equals("gif"))
fileType = 0;
else if (ext.equals("jpg"))
fileType = 1;
else if (ext.equals("png"))
fileType = 2;
else if (ext.equals("tif"))
fileType = 3;
else if (ext.equals("bmp"))
fileType = 4;
switch (fileType)
case 0:
if (blnTrans)
NewImageProducer img = new NewImageProducer(pixels, TransColor, dim);
try
FileOutputStream fos1 = new FileOutputStream(file);
Acme.JPM.Encoders.ImageEncoder e = new GifEncoder(img, fos1);
e.encode();
fos1.close();
catch (java.io.IOException e) {}
else
BufferedImage imb = new BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_INT_RGB);
imb.setRGB(0, 0, (int)dim.getWidth(), (int)dim.getHeight(), pixels, 0, (int)dim.getWidth());
try
FileOutputStream fos2 = new FileOutputStream(file);
Acme.JPM.Encoders.ImageEncoder e = new GifEncoder(imb, fos2);
e.encode();
fos2.close();
catch (java.io.IOException e) {}
catch (Exception er) {}
break;
case 1:
try
BufferedImage bimg = new java.awt.image.BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_INT_RGB);
bimg.setRGB(0, 0, (int)dim.getWidth(), (int)dim.getHeight(), pixels, 0, (int)dim.getWidth());
//Encode as a JPEG
FileOutputStream fos3 = new FileOutputStream(file);
JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(fos3);
jpeg.encode(bimg);
fos3.close();
catch (java.io.IOException e) {}
break;
case 2:
try
BufferedImage bimg = new java.awt.image.BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_INT_RGB);
bimg.setRGB(0, 0, (int)dim.getWidth(), (int)dim.getHeight(), pixels, 0, (int)dim.getWidth());
//Encode as a PNG
FileOutputStream fos3 = new FileOutputStream(file);
PNGEncodeParam pp = PNGEncodeParam.getDefaultEncodeParam(bimg);
ImageEncoder png = ImageCodec.createImageEncoder("PNG", fos3, pp);
png.encode(bimg);
fos3.close();
catch (java.io.IOException e) {}
break;
case 3:
try
BufferedImage bimg = new java.awt.image.BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
bimg.setRGB(0, 0, (int)dim.getWidth(), (int)dim.getHeight(), pixels, 0, (int)dim.getWidth());
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FileOutputStream fos3 = new FileOutputStream(file);
TIFFEncodeParam tp = new TIFFEncodeParam();
ImageEncoder tif = ImageCodec.createImageEncoder("TIFF", fos3, tp);
tif.encode(bimg);
fos3.close();
catch (java.io.IOException e) {}
break;
case 4:
try
BufferedImage bimg = new java.awt.image.BufferedImage((int)dim.getWidth(), (int)dim.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
bimg.setRGB(0, 0, (int)dim.getWidth(), (int)dim.getHeight(), pixels, 0, (int)dim.getWidth());
//Encode as a BMP
FileOutputStream fos3 = new FileOutputStream(file);
BMPEncodeParam bp = new BMPEncodeParam();
ImageEncoder png = ImageCodec.createImageEncoder("BMP", fos3, bp);
png.encode(bimg);
fos3.close();
catch (java.io.IOException e) {}
break;
} //end of switch.
} //end of file option.
//Here is NewImageProducer
import java.awt.image.*;
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.awt.color.*;
class NewImageProducer implements ImageProducer{
private Vector vector = null;
int[] pixels;
int alpha;
Dimension dim;
public NewImageProducer(int[] pixels, int alpha, Dimension dim){
vector = new Vector();
this.pixels = pixels;
this.alpha = alpha;
this.dim = dim;
public void addConsumer(ImageConsumer ic){
if (isConsumer(ic) == false)
vector.addElement(ic);
public void removeConsumer(ImageConsumer ic){
if (isConsumer(ic) == true)
vector.removeElement(ic);
public boolean isConsumer(ImageConsumer ic){
return vector.indexOf(ic) > -1;
public void startProduction(ImageConsumer ic){
addConsumer(ic);
int x = (int)dim.getWidth();
int y = (int)dim.getHeight();
Hashtable ht = new Hashtable();
byte[] r = new byte[pixels.length];
byte[] g = new byte[pixels.length];
byte[] b = new byte[pixels.length];
byte[] a = new byte[pixels.length];
for (int i=0; i<pixels.length; i++)
if (pixels[i] == alpha)
a[i] = (byte)0;
else
a[i] = (byte)255;
for (int i=0; i<pixels.length; i++)
r[i] = (byte)((pixels[i] & 0xFF0000) >> 16);
g[i] = (byte)((pixels[i] & 0x00FF00) >> 8);
b[i] = (byte)(pixels[i] & 0x0000FF);
ColorModel cm=null;
try{
cm = new IndexColorModel(8, pixels.length, r, g, b, a);
catch (Exception e){e.printStackTrace();}
Vector v = (Vector)vector.clone();
Enumeration e = v.elements();
while (e.hasMoreElements()){
ic = (ImageConsumer)e.nextElement();
ic.setColorModel(cm);
ic.setDimensions(x, y);
ic.setProperties(ht);
ic.setHints(ImageConsumer.RANDOMPIXELORDER);
int[] p = new int[pixels.length];
for (int i=0; i<pixels.length; i++)
p[i] = i;
ic.setPixels(0, 0, x, y, cm, p, 0, x);
ic.imageComplete(ImageConsumer.STATICIMAGEDONE);
public void requestTopDownLeftRightResend(
ImageConsumer ic){;
//Here is Utils
import java.io.File;
public class Utils {
public final static String jpeg = "jpeg";
public final static String jpg = "jpg";
public final static String gif = "gif";
public final static String tiff = "tiff";
public final static String tif = "tif";
public final static String png = "png";
public final static String bmp = "bmp";
* Get the extension of a file.
public static String getExtension(File f) {
String ext = null;
String s = f.getName();
int i = s.lastIndexOf('.');
if (i > 0 && i < s.length() - 1) {
ext = s.substring(i+1).toLowerCase();
return ext;
Get the Acme class at:
http://www.acme.com/java/software/Package-Acme.JPM.html

How to save an image to file without rendering to screen?

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import com.jrefinery.chart.JFreeChart;
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import com.jrefinery.data.XYDataset;
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        catch (java.io.IOException e) {
            System.out.println(e.getMessage());
}Regards,
Dave Gilbert
www.object-refinery.com

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How to save greyscale image as jpeg?

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