java - 在处理中重新绘制当前像素周围的选定像素区域

Question

我是处理新手。我正在尝试更改每个像素周围像素的颜色(或其他参数，如色调、饱和度等)。

我没有得到任何改变而不是期望的结果。请帮助任何人 (+

PImage imgg;
void setup() {
    size(250,166);  
    imgg = loadImage("input.jpg");
    loadPixels();
    image(imgg,0,0);
}

void draw() {
    for (int i = 0; i < imgg.width; i++) {
        for (int j = 0; j < imgg.height; j++) {
           //get the brightness value of the current pixel
           int Bright_coeff = int(brightness(pixels[j*imgg.width+i]));
           //calculate the area around the current pixel
           int Bright_dist = Bright_coeff/10  ;
           //area around that pixel will update its color
           for (int x = 0; x < imgg.width; x++ ){
              for (int y = 0; y < imgg.height; y++){
                  //check if the distance between iterating pixels and current pixel from above cycle is less than Bright_dist
                  if ( dist(x, y, i, j)<Bright_dist ){
                      color qwerty = color(random(1,255),random(1,255),random(1,255)) ;
                      pixels[y*imgg.width+x] = qwerty;
                      updatePixels();
                  }else {
                      updatePixels();
                  }
               }
            }    
        }
    }
}

Answer 1

loadPixels()加载当前显示窗口的像素数据。
在 image() 将图像绘制到窗口后，必须完成 loadPixels :

PImage imgg;
void setup() {
    size(128,128);  
    imgg = loadImage("input.jpg");

    image(imgg,0,0);
    loadPixels();
}

显示仅在draw() 之后更新一次已被执行。 updatePixels()设置显示窗口的像素数据。在 draw() 结束时执行一次就足够了:

void draw() {

    // [...]

    updatePixels();
}