src/org/nutz/img/Colors.java
public static int getGray(BufferedImage srcIm, int x, int y) {
        int grayValue = getLuminance(srcIm, x, y);
        int newPixel = 0;
        newPixel = (grayValue << 16) & 0x00ff0000 | (newPixel & 0xff00ffff);
        newPixel = (grayValue << 8) & 0x0000ff00 | (newPixel & 0xffff00ff);
        newPixel = (grayValue) & 0x000000ff | (newPixel & 0xffffff00);
        return newPixel;
    }
public static int getGray(BufferedImage srcIm, int x, int y) {
        int grayValue = getLuminance(srcIm, x, y);
        int newPixel = 0;
        newPixel = (grayValue << 16) & 0x00ff0000 | (newPixel & 0xff00ffff);
        newPixel = (grayValue << 8) & 0x0000ff00 | (newPixel & 0xffff00ff);
        newPixel = (grayValue) & 0x000000ff | (newPixel & 0xffffff00);
        return newPixel;
    }
public static int getGray ( BufferedImage srcIm , int x , int y ) { int grayValue = getLuminance ( srcIm , x , y ) ; int newPixel = 0 ; newPixel = ( grayValue << 16 ) & 0x00ff0000 | ( newPixel & 0xff00ffff ) ; newPixel = ( grayValue << 8 ) & 0x0000ff00 | ( newPixel & 0xffff00ff ) ; newPixel = ( grayValue ) & 0x000000ff | ( newPixel & 0xffffff00 ) ; return newPixel ; }
获取图片指定像素点的灰度值

@param srcIm
源图片
@param x
横坐标
@param y
纵坐标
@return 灰度值
获取图片指定像素点的灰度值