setRGB() in java

Question

I am using setRGB() for changing the values of the pixel of an image.

int rgb=new Color(0,0,0).getRGB();
image1.setRGB(i,j,rgb); //where i,j is the boundaries of the image

Here,i am setting all the pixel values with white. But the change is not getting reflected in the image. Any One knows about the setRGB() how it works?

May be there is another error or you went a wrong way. So please post more code. — Reporter, Aug 14 '12 at 11:51
A couple of points.. - Color(0,0,0) will be black - setRGB sets an individual pixel in an image, not the whole image — Jimmy, Aug 14 '12 at 11:55
What is `image1`? FYI: values RGB `0,0,0` are mapped to _black_ while RGB values `255,255,255` are mapped to _white_ — pankar, Aug 14 '12 at 11:58

score 25 · Answer 1 · edited Nov 03 '15 at 21:38

25

White is in RGB 255,255,255 so:

Color myWhite = new Color(255, 255, 255); // Color white
int rgb = myWhite.getRGB();

try {
    BufferedImage img = null;
    try {
        img = ImageIO.read(new File("bubbles.bmp"));
    }
    catch (IOException e) {
    }

    for (int i = 0; i < 100; i++) {
        for (int j = 0; j < 100; j++) {
            img.setRGB(i, j, rgb);
        }
    }

    // retrieve image
    File outputfile = new File("saved.png");
    ImageIO.write(img, "png", outputfile);
}
catch (IOException e) {
}

edited Nov 03 '15 at 21:38

Shawn Mehan

4,513
9
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answered Aug 14 '12 at 12:07

Lo Juego

1,305
11
12

If this answered your question, please accept it as the answer so the question gets marked as answered. – JeffC Nov 03 '15 at 21:03

score 2 · Answer 2 · answered Sep 17 '13 at 09:23

2

 Color col = new Color(newValue, newValue, newValue);
            image1.setRGB(i, j, col.getRGB());

answered Sep 17 '13 at 09:23

Lê Quang Duy

767
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14

setRGB() in java

2 Answers2

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