Java getting area of pixels and turning into an image - how can this be made more efficient?

Question

I have some code which will grab an area of pixels on the screen and turn them into a BufferedImage object. The thing is - it is MASSIVELY slow, so I am looking for support in increasing its speed!

The code is as follows:

public BufferedImage getScreenPortion(Point topleft,Point bottomright){

    int width = bottomright.x - topleft.x;
    int height = bottomright.y - topleft.y;
    BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

    for(int p=0;p<height;p++){

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

        Color pixel = robot.getPixelColor(topleft.x+i, topleft.y+p);
        bi.setRGB(i, p, pixel.getRGB());
        }
    }

    return bi;


}

and I am passing it : getScreenPortion(new Point(1081,824),new Point(1111,844)); which means I am trying to get an areas approximately 30x20 - yet it is taking in the region of 7 seconds which is horrendously slow!

Is there a reason this was tagged 'oracle'? – Mark J. Bobak Nov 17 '11 at 22:51 — Mark J. Bobak, Nov 17 '11 at 22:51
Fixed it - I now instead use: – RenegadeAndy Nov 17 '11 at 22:53 — RenegadeAndy, Nov 17 '11 at 22:53

score 3 · Accepted Answer · edited Nov 18 '11 at 00:13

3

Fixed it - I now instead use:

Rectangle screenRect = new Rectangle(topleft.x, topleft.y, width, height);
BufferedImage grid = robot.createScreenCapture(screenRect);

edited Nov 18 '11 at 00:13

philipvr

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answered Nov 17 '11 at 22:54

RenegadeAndy

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To create a code block, indent by four spaces. Do not use [code][/code]. – philipvr Nov 18 '11 at 00:15
+1 Some related examples may be found [here](http://stackoverflow.com/questions/3742731/java-how-to-draw-constantly-changing-graphics). – trashgod Nov 18 '11 at 01:15

Java getting area of pixels and turning into an image - how can this be made more efficient?

1 Answers1