本人用的Blue J 编译器
public ImageResource makeGray(ImageResource inImage){
//I make a blank image of the same size
ImageResource outImage = new ImageResource(inImage.getWidth(),inImage.getHeight());
//for each pixel in outImage
for(Pixel pixel : outImage.pixels()){
//look at the corresponding pixel in inImage
Pixel inPixel = inImage.getPixel(pixel.getX(),pixel.getY());//在这里如果使用Pixel inPixel = new inImage.getPixel(pixel.getX(),pixel.getY()); 则会报错:程序包inImage不存在
//compute inPixel's red+ inPixel's green + inPixel's blue
//divide that sum by 3 (call it average)
int average = (inPixel.getRed()+inPixel.getBlue()+inPixel.getGreen())/3;
//int average=90;
//set pixel's red to average
pixel.setRed(average);
//set pixel's green to average
pixel.setGreen(average);
//set pixel's blue to average
pixel.setBlue(average);
}
//outImage is your answer
return outImage;
}
红色代码部分如果换成
Pixel inPixel = new inImage.getPixel(pixel.getX(),pixel.getY());
会报错:程序包inImage不存在
解决方法是去掉 new 就可以正常运行了,具体原理我也不是很清楚,如果有大神懂的还希望指教以下。