Been stuck for days! any help would be appriciated...

[juddy1]

hey...

Ok this is really starting to annoy me so please please help!

I am trying to create a program which will take in a colour picture, turn it into an array of pixels covert those pixels into greyscale and put array back together again to make a greyscale copy of the first image.

The code below is of the section i am stuck on. Basically i want to use color(int rgb) constructor to make a new object which i can pass my color pixel array into. i then want to create 3 new ints and make them equal to the red, green and blue values of my new Color.


for (int i = 0; i < (width*height); i++){

Color c = new Color(pixels*);

int red = getRed();
int green = getGreen();
int Blue = getBlue();
}

*the array of color pixels.

Im new so please be gentle!

cheers

[Nicholas Jordan]

Study the java image io classes, or emulate an image with a two dimensional array of a placeholder class you write yourself.

Bring your lunch, your gonna be awhile before you can do Color.getRed() and so on.

Graphics is rather advanced. I suggest ( if you need gentle ) move to some other simplified program such as hello world or develope simple array skills before working on what you have here.

[juddy1]

thanks for the reply... done a little more work on it now got it to compile but instead of a greyscale image being returned i get a black image....

my code is as follows:

class SaveGreyMenuListnr implements ActionListener {

private ImagePanel panel = null;

SaveGreyMenuListnr (ImagePanel pn) {

panel = pn;

}

public void actionPerformed (ActionEvent ae) {


Image displayed = panel.getDisplayImage();

int width = displayed.getWidth(panel);
int height = displayed.getHeight(panel);

int pixels[] = new int[width*height];



PixelGrabber pg = new PixelGrabber(displayed, 0, height, width, height, pixels, 0, width);


try{

pg.grabPixels();


} catch (InterruptedException e) {


System.err.println("interrupted waiting for pixels");

}

for (int i = 0; i < (width*height); i++){

Color myColor = new Color(pixels[i]);


int Red = myColor.getRed();

int Green = myColor.getGreen();

int Blue = myColor.getBlue();

double temp = 0.56 * (double)Green + 0.33 *(double) Red + 0.11 *(double) Blue;
myColor = new Color((int)temp,(int)temp,(int)temp);
int compressedInt = myColor.getRGB();

pixels[i] = compressedInt;

}


Image image = panel.getToolkit().createImage(new MemoryImageSource(width,height,pixels,0,width));

panel.setDisplayImage(image);
panel.repaint();
}

}


All i can think of is that when im using the getRed,getGreen and getBlue methods they are returning 0 values.

I tested this by putting a System.out.println(Red); and it just returned a large number of 0's...

Im sure its something easy ive missed if anyone has any bright ideas i would be very grateful!

[Nicholas Jordan]

Where are you getting the image from? Why is there ActionListener / ActionPerformed?

Code is a little messy, but that is common on beginner code, what we need to do here is grasp where the image comes from, pass that to PixelGrabber, no?

I want to do something like this in my own program, such blunderous code does not bother me - what we need to establish first is where the graphic is coming from......

[meth]

hi, im referring to ur code:

int pixels[] = new int[width*height];
.
.
for (int i = 0; i < (width*height); i++){
Color myColor = new Color(pixels[i]);
.
.
.
myColor = new Color((int)temp,(int)temp,(int)temp);
int compressedInt = myColor.getRGB();
pixels[i] = compressedInt; }

can u pls explain to me wat does the above codes for? thx in advance.

}

[meth]

hi, im referring to ur code:

int pixels[] = new int[width*height];
.
.
for (int i = 0; i < (width*height); i++){
Color myColor = new Color(pixels[i]);
.
.
.
myColor = new Color((int)temp,(int)temp,(int)temp);
int compressedInt = myColor.getRGB();
pixels[i] = compressedInt; }

can u pls explain to me wat does the above codes for? thx in advance.

}

[JosAH]

hi, im referring to ur code:

@Meth: erm, this thread is more than two years old; it is stone dead.

kind regards,

Jos

[meth]

lol i know. i was juz replying here coz i dunno wanna make a double post. but i posted mine anyway, would u pls be kind enogh to help me sir? how to count frequency of the color? ur help is appreciated.

[Fubarable]

Locking this old thread.