java - 缓冲图像 : How to certainly determine a pixel color

Question

我有一张以 PNG 格式编码的位图。如何确定哪里是黑哪里是白？

            final int[] p = new int[1];
            int iter = 0;
            for (int i = 0; i < image.getWidth(); i++) {
                for (int j = 0; j < image.getHeight(); i++) {
                    pixels[iter] = image.getData().getPixel(i, j, p)[0];
                    iter++;
                }
            }

总是每个像素返回 1。

Answer 1

BufferedImage image = ImageIO.read(file);
// Getting pixel color by position x=100 and y=40 
int clr=  image.getRGB(100,40); 
int  red   = (clr & 0x00ff0000) >> 16;
int  green = (clr & 0x0000ff00) >> 8;
int  blue  =  clr & 0x000000ff;

红色、绿色和蓝色将是 x=100 和 y=40 处像素的 RGB 值