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xizi9930

银虫 (小有名气)

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虫号: 1105377
注册: 2010-09-22
专业: 计算机软件

[交流] 【求助】用java编写为什么我获取的像素值为负呢？

import java.awt.*;
import java.awt.image.*;

class Getpixel {
public static void main(String[] args) {

Toolkit getPackage = Toolkit.getDefaultToolkit();

MediaTracker tracker = new MediaTracker(new Canvas());
Image img = getPackage.getImage("e:\\3.jpg "

;

tracker.addImage(img, 0);
try {
tracker.waitForID(0);
} catch (InterruptedException e) {
e.printStackTrace();
}

int w = img.getWidth(null);
int h = img.getHeight(null);

int[] pixels = new int[w * h];
int gray;
PixelGrabber pg = new PixelGrabber(img, 0, 0, w, h, pixels, 0, w);
try {
pg.grabPixels();
} catch (InterruptedException e) {
System.err.println("interrupted waiting for pixels!"

;
return;
}
if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
System.err.println("image fetch aborted or errored"

;
return;
}
System.out.println( "像素矩阵为: "

;
for (int j = 0; j < h; j++) // 扫描列
{
for (int i = 0; i < w; i++) // 扫描行
{
System.out.print(pixels[w * j + i] + " "

;
}
System.out.println(" "

;
}

}
}

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