如何使用getRGB在Java中获取图像的像素值数组 [英] How to get the array of pixel values for an image in java using getRGB

问题描述

我是Java图像处理的新手.实际上，我要执行的操作是将图像的所有像素值保存到数组rgbArray[]中，问题是我在数组的所有索引(即数组的所有索引)中获得相同的值数组具有相同的值.下面给出了一部分代码:

I'm new to image processing in java. Actually what I'm trying to do is to save all the pixel values of an image into an array rgbArray[], and the problem is that I'm getting the same values in all the indexes of an array i.e. all the indexes of the array have the same value. A part of code is given below:

int[] rgbArray=new int[w*h];     // Array to store the Pixel values
BufferedImage buffer = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); 
buffer.getRGB(0, 0, w, h, rgbArray, 0, w );
for(int i=0;i<w*h;i++)
 {
  System.out.println("rgbArray["+i+"] = "+ rgbArray[i]);
 }

对于rgbArray中的所有索引，我得到的输出是-16777216.图像的每个像素如何具有相同的值?以及如何获得正确的像素值?

The output which i'm getting is -16777216 for all indexes in rgbArray. How is it possible to have the same value for each and every pixel of the image? And how do I get the correct pixel value??

推荐答案

由于不为BufferedImage提供任何值，因此每个像素默认为alpha = 255，红色= 0，绿色= 0和蓝色= 0；将所有这些都放入1 int，您将得到-16777216.我是从这里得到的:

Since you do not provide any values for the BufferedImage, every pixel defaults to alpha = 255, red = 0, green = 0, and blue = 0; Put all of those into 1 int and you get -16777216. I got this from:

int val = buffer.getRGB(5, 23);
int a = (0xff000000 & val) >>> 24;
int r = (0x00ff0000 & val) >> 16;
int g = (0x0000ff00 & val) >> 8;
int b = (0x000000ff & val);
System.out.println("a " + a + " r " + r + " g " + g + " b " + b);

哪个会产生255 r 0 g 0 b 0.

Which produces a 255 r 0 g 0 b 0.

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