Java : BufferedImage to Bitmap format

Question

I have a program in which i capture the screen using the code :

robot = new Robot();
BufferedImage img = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));

Now i want to convert this BufferedImage into Bitmap format and return it through a function for some other need, Not save it in a file. Any help please??

http://stackoverflow.com/questions/3961687/bufferedimage-to-bmp-in-java — John, Jun 13 '11 at 13:30

aioobe · Accepted Answer · 2011-06-13T13:39:17.307

7

You need to have a look at ImageIO.write.

The Java Tutorials: Writing/Saving an Image

If you want the result in the form of a byte[] array, you should use a ByteArrayOutputStream:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(yourImage, "bmp", baos);
baos.flush();
byte[] bytes = baos.toByteArray();
baos.close();

edited Jun 13 '11 at 13:39

answered Jun 13 '11 at 13:28

aioobe

413,195
112
811
826

Well I had already viewed that class but it writes into a file Stream but i dont want to write it into a file i want to convert it into bitmap format in the memory itself and return it through a funtion. – Anand S Kumar Jun 13 '11 at 13:35
Thank you i think that may help!! – Anand S Kumar Jun 13 '11 at 13:43

score 2 · Answer 2 · answered Jun 13 '11 at 13:42

When you say "into Bitmap format" you then mean the data (as in a byte array)? If that's the case, then you can use ImageIO.write (like suggested above).
If you don't want to save it to a file, but just want to get the data, can you use a ByteArrayOutputStream like this:

ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(img, "BMP", out);
byte[] result = out.toByteArray();

score 1 · Answer 3 · answered Jun 13 '11 at 14:51

To see the image types available for write in the J2SE (ex. JAI), see ImageIO.getWriterFileSuffixes():

E.G.

class ShowJavaImageTypes {

    public static void main(String[] args) {
        String[] imageTypes =
            javax.imageio.ImageIO.getWriterFileSuffixes();
        for (String imageType : imageTypes) {
            System.out.println(imageType);
        }
    }
}

Output

For this Sun Java 6 JRE on Windows 7.

bmp
jpg
wbmp
jpeg
png
gif
Press any key to continue . . .

See similar ImageIO methods for MIME types, formats, and the corresponding readers.

score -1 · Answer 4 · edited Jan 12 '20 at 23:46

-1

You can simply do this:

public Bitmap getBitmapFromBufferedImage(BufferedImage image)
{
     return redResult.getBitmap();
}

edited Jan 12 '20 at 23:46

Nikolai Shevchenko

7,083
8
33
42

answered Jan 12 '20 at 23:02

Raul Lucaciu

132
7

no such `BufferedImage::getBitmap()` in my IDE here – daparic May 07 '20 at 07:29
Oh... yeah, that's right. Can you tell me your use case? – Raul Lucaciu May 07 '20 at 11:55

Java : BufferedImage to Bitmap format

4 Answers4

E.G.

Output