如何在java中删除图像中的白色像素 [英] How to Delete the white pixels in an image in java

问题描述

如何在将图像加载到面板中之前删除图像的白色像素

面板中加载图像的方法是：

How can I remove the white pixels of an image before loading it in the Panel
the method for loading image in panel is:

public  void ajouterImage(File fichierImage) {   
    // desiiner une image à l'ecran 
    try {
        monImage = ImageIO.read(fichierImage);
    } catch (IOException e) {
        e.printStackTrace();
    }
    repaint(); 
}  

推荐答案

你无法删除像素来自图像，但你确定可以改变它的颜色，甚至让它变得透明。

You can't remove a pixel for say from an image, but you sure can change the color of it, or even make it transparent.

假设你有一个像素数组作为某个变量，你可以给它 BufferedImage 的RGB值。像素数组将被称为像素：

Let's say you have a pixel array as a variable somewhere, and you can give it the RGB value of your BufferedImage. The pixel array will be called pixels:

try {
    monImage = ImageIO.read(fichierImage);
    int width = monImage.getWidth();
    int height = monImage.getHeight();
    pixels = new int[width * height];
    image.getRGB(0, 0, width, height, pixels, 0, width);

    for (int i = 0; i < pixels.length; i++) {
        // I used capital F's to indicate that it's the alpha value.
        if (pixels[i] == 0xFFffffff) {
            // We'll set the alpha value to 0 for to make it fully transparent.
            pixels[i] = 0x00ffffff;
        }
    }
} catch (IOException e) {
    e.printStackTrace();
}

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