使用getPixel（）方法提取的巨大负值 [英] Huge negative values extracted by using getPixel() method

问题描述

我正在开发一个图像处理应用程序的问题（这里是新手）。我试图通过使用 getPixel（）方法提取特定像素的值。

I am having a problem with an image processing app I am developing (newbie here). I am trying to extract the value of specific pixels by using the getPixel() method.

我遇到了问题。我从这种方法得到的数字是一个巨大的负数，类似于-1298383。这是正常的吗？我该如何解决？

I am having a problem though. The number I get from this method is a huge negative number, something like -1298383. Is this normal? How can I fix it?

谢谢。

推荐答案

我不是专家，但是对我来说，看起来你得到的是十六进制值。也许你想要更像可理解的东西，比如每个RGB层的值。

I'm not an expert, but to me it looks like you are getting the hexadecimal value. Perhaps you want something more understandable like the value of each RGB layer.

将解包像素转换为RGB您应该执行以下操作的值：

To unpack a pixel into its RGB values you should do something like:

private short[][] red;
private short[][] green;
private short[][] blue;

 /** 
 * Map each intensity of an RGB colour into its respective colour channel
 */
private void unpackPixel(int pixel, int row, int col) {
    red[row][col] = (short) ((pixel >> 16) & 0xFF);
    green[row][col] = (short) ((pixel >> 8) & 0xFF);
    blue[row][col] = (short) ((pixel >> 0) & 0xFF);
}

在每个频道发生变化后，你可以打包像素返回。

And after changes in each channel you can pack the pixel back.

/** 
 * Create an RGB colour pixel.
 */
private int packPixel(int red, int green, int blue) {
    return (red << 16) | (green << 8) | blue;
}

如果不是您想要的，请抱歉。

Sorry if it is not what you are looking for.

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