如何从PNG文件中读取像素？ [英] How do I read pixels from a PNG file?

问题描述

我知道如何使用Robot，Windowtester或FEST捕获屏幕截图。我也知道如何使用机器人从屏幕上读取像素。

I know how to capture a screenshot by using Robot, Windowtester or FEST. I also know how to read a pixel from the screen by using robot.

int x = 10;
int y = 10; 
Color px = getPixelColor(int x, int y);

但是，我不知道如何从已捕获的图像中读取像素。我打算将当前图像与文件中的图像进行比较。让我们说两者都是PNG。是否有任何框架可用于逐像素地比较图像？

However, I don't know how to read a pixel from an image that is already captured. I'm planning to compare a current image, with an image from file. Lets say both are PNG. Are there any frameworks that I can use to compare images pixel by pixel?

推荐答案

这是用Java吗？如果是这样，您可以使用 ImageIO.read（yourImage.png）来获取 BufferedImage 。这将有一个 getData（）方法，它将为您提供 Raster 对象，您可以在其上调用 getPixel 。参见链接

Is this in Java? If so, you can use ImageIO.read( "yourImage.png" ) to get a BufferedImage. That will have a getData() method which will give you a Raster object, on which you can call getPixel. See link

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